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9th Class Chemistry Notes - Chapter Wise MCQs & Short Questions MCQs Bank

Verified Question Bank for High-Performance Exam Preparation.

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1

During oxidation

A
the oxidation number?
B
Increases
✅
C
Decreases
D
Stays same
2

Which is an example of an oxidizing agent?

A
Na
B
Mg
C
O2
✅
D
H2
3

Electrochemical processes in batteries are based on?

A
Acid-base
B
Redox
✅
C
Physical change
D
Nuclear
4

Oxidation state of Sulfur in H2SO4 is?

A
+4
B
+6
✅
C
-2
D
0
5

Hydrated iron(III) oxide is commonly known as?

A
Salt
B
Rust
✅
C
Lime
D
Potash
6

Oxidation state of Fluorine in compounds is always?

A
+1
B
0
C
-1
✅
D
-2
7

A reaction that releases heat energy is?

A
Endothermic
B
Exothermic
✅
C
Isothermal
D
Nuclear
8

A reaction that absorbs heat energy is?

A
Endothermic
✅
B
Exothermic
C
Combustion
D
Redox
9

The heat change at constant pressure is?

A
Entropy
B
Enthalpy
✅
C
Temperature
D
Power
10

Energy is released when chemical bonds are?

A
Broken
B
Formed
✅
C
Stretched
D
Weakened
11

Energy is absorbed when chemical bonds are?

A
Broken
B
Formed
✅
C
Balanced
D
Frozen
12

Which is an example of an exothermic reaction?

A
Photosynthesis
B
Combustion of methane
✅
C
Melting of ice
D
Boiling water
13

Which is an example of an endothermic reaction?

A
Burning wood
B
Photosynthesis
✅
C
Freezing water
D
Rusting iron
14

Standard unit of enthalpy is?

A
Joules
B
Kilojoules per mole
✅
C
Watts
D
Calories
15

A negative delta H (-ΔH) indicates?

A
Endothermic
B
Exothermic
✅
C
Equilibrium
D
No reaction
16

A positive delta H (+ΔH) indicates?

A
Endothermic
✅
B
Exothermic
C
Fast reaction
D
Combustion
17

The minimum energy required to start a reaction is?

A
Bond energy
B
Activation energy
✅
C
Potential energy
D
Solar energy
18

A substance that speeds up a reaction without being consumed is?

A
Reactant
B
Product
C
Catalyst
✅
D
Solvent
19

Biological catalysts are called?

A
Inhibitors
B
Enzymes
C
Isotopes
✅
D
Radicals
20

A catalyst works by?

A
Increasing energy
B
Lowering activation energy
✅
C
Absorbing heat
D
Changing products
21

Standard enthalpy change is measured at?

A
0 K
B
298 K
✅
C
500 K
D
100 K
22

The peak of an energy pathway diagram represents?

A
Reactants
B
Products
C
Activation energy barrier
✅
D
Enthalpy
23

Respiration is which type of reaction?

A
Endothermic
B
Exothermic
✅
C
Physical
D
Nuclear
24

Photospiration produces energy in the form of?

A
DNA
B
ATP
✅
C
RNA
D
Glucose
25

Respiration without oxygen is called?

A
Aerobic
B
Anaerobic
✅
C
Combustion
D
Photosynthesis
26

Bond energy is measured in?

A
m/s
B
kJ/mol
✅
C
kg
D
Liters
27

Triple bonds have bond energy compared to single bonds?

A
Lower
B
Higher
✅
C
Same
D
Zero
28

The process of breaking a specific bond is?

A
Bond dissociation
✅
B
Bond formation
C
Melting
D
Mixing
29

What happens to a catalyst after the reaction?

A
Consumed
B
Remains unchanged
✅
C
Evaporates
D
Becomes solid
30

Catalysts do not affect the reaction's?

A
Speed
B
Rate
C
Equilibrium position
✅
D
Activation energy
31

Which reaction involves positive ΔH?

A
Combustion
B
Freezing
C
Melting of ice
✅
D
Neutralization
32

Activation energy determines the reaction's?

A
Color
B
Yield
C
Rate/Speed
✅
D
Mass
33

Respiration provides energy for cellular?

A
Movement
B
Growth
C
Repair
D
All of these
✅
34

Enthalpy of reaction is ΔH = (Bond energy of reactants) - (?)

A
Bond energy of products
✅
B
Mass of products
C
Volume
D
Time
35

If ΔH is negative

A
the reaction feels?
B
Cold
C
Hot
D
Neutral
✅
36

Enzymes are made of?

A
Fats
B
Proteins
✅
C
Sugars
D
Minerals
37

Lowering activation energy makes a reaction?

A
Slower
B
Faster
✅
C
Stop
D
Reverse
38

A reaction that proceeds in both directions is?

A
Irreversible
B
Reversible
✅
C
Static
D
Final
39

Dynamic equilibrium occurs when?

A
Forward reaction stops
B
Reverse reaction stops
C
Rates of both reactions are equal
✅
D
Reactants are finished
40

For equilibrium to occur

A
the system must be?
B
Open
C
Closed
D
Large
41

What remains constant at equilibrium?

A
Temperature only
B
Concentration of reactants and products
✅
C
Volume only
D
Color only
42

Le Chatelier's Principle explains how a system responds to?

A
Gravity
B
Disturbances/Changes
✅
C
Sunlight
D
Sound
43

If concentration of reactants increases

A
equilibrium shifts?
B
Left
C
Right
D
Up
✅
44

In an exothermic reaction

A
increasing temperature shifts equilibrium?
B
Toward products
C
Toward reactants
D
No change
45

Increasing pressure in a gaseous system favors the side with?

A
More molecules
B
Fewer gas molecules
✅
C
No molecules
D
Higher mass
46

The ratio of products to reactants at equilibrium is the?

A
Rate constant
B
Equilibrium constant (K)
✅
C
Atomic ratio
D
Avogadro number
47

Chemistry primarily studies what?

A
Mathematics
B
Matter and its interactions with energy
✅
C
Philosophy
D
Literature
48

A large value of K indicates?

A
Reactants are favored
B
Products are favored
✅
C
Slow reaction
D
No reaction
49

What occurs during a chemical reaction?

A
Atoms disappear
B
Molecules cease to exist
C
Bonds break and form
✅
D
Energy is destroyed
50

A small value of K indicates?

A
Reactants are favored
✅
B
Products are favored
C
Fast reaction
D
Equilibrium
51

Which branch of chemistry studies carbon-containing compounds?

A
Biochemistry
B
Organic chemistry
✅
C
Physical chemistry
D
Inorganic chemistry
52

Equilibrium constant K changes with?

A
Pressure
B
Concentration
C
Temperature
✅
D
Catalyst
53

The study of chemical processes within living organisms is called?

A
Analytical chemistry
B
Physical chemistry
C
Biochemistry
✅
D
Organic chemistry
54

Adding a catalyst to an equilibrium system?

A
Shifts it right
B
Shifts it left
C
Speeds up both rates equally
✅
D
Increases K
55

Which branch of chemistry is essential for drug formulation?

A
Nuclear chemistry
B
Environmental chemistry
C
Medicinal chemistry
✅
D
Geochemistry
56

Removing a product from a reversible reaction shifts it?

A
Toward reactants
B
Toward products
✅
C
No change
D
Stops it
57

What is the study of the chemical composition of Earth's crust?

A
Geochemistry
✅
B
Astrochemistry
C
Biochemistry
D
Physical chemistry
58

Unit of Kc for the reaction H2 + I2 <-> 2HI is?

A
mol/L
B
L/mol
C
No unit
✅
D
atm
59

Which branch focuses on non-carbon-based compounds like metals?

A
Organic chemistry
B
Inorganic chemistry
✅
C
Analytical chemistry
D
Physical chemistry
60

Expression for K is?

A
[Reactants]/[Products]
B
[Products]/[Reactants]
✅
C
[Products]+[Reactants]
D
[Products]-[Reactants]
61

The study of chemical reactions in space is called?

A
Geochemistry
B
Astrochemistry
✅
C
Nuclear chemistry
D
Biochemistry
62

Haber process is used to synthesize?

A
Oxygen
B
Ammonia
✅
C
Sulfuric acid
D
Methane
63

What is the focus of Physical chemistry?

A
Biological studies
B
Matter-energy relationships
✅
C
Analysis of material
D
Compounds
64

Equilibrium is a state?

A
Static
B
Dynamic
✅
C
Irreversible
D
Permanent
65

Which branch determines the composition of substances?

A
Analytical chemistry
✅
B
Organic chemistry
C
Physical chemistry
D
Biochemistry
66

In Kp

A
'p' stands for?
B
Proton
C
Pressure
D
Power
67

What is used in medical imaging like MRI and X-rays?

A
Organic chemistry
B
Inorganic chemistry
C
Nuclear chemistry
✅
D
Physical chemistry
68

Thermal decomposition of Calcium carbonate is?

A
Irreversible
B
Reversible
✅
C
Fast
D
Redox
69

Developing eco-friendly materials is the role of?

A
Biochemistry
B
Environmental chemistry
✅
C
Nuclear chemistry
D
Inorganic chemistry
70

If temperature increases in an endothermic reaction

A
K?
B
Decreases
✅
C
Increases
D
Stays same
71

Which process in cooking is a chemical reaction?

A
Weighing
B
Caramelization
✅
C
Cutting
D
Washing
72

Small K means equilibrium lies to the?

A
Right
B
Left
✅
C
Middle
D
Top
73

Cleaning products contain chemicals that break down grease called?

A
Solvents
B
Surfactants
✅
C
Enzymes
D
Isotopes
74

Le Chatelier's Principle helps optimize?

A
Industrial processes
✅
B
Reading speed
C
Cooking time
D
Weight loss
75

Vaccine production involves which combination?

A
Science and Technology
✅
B
Art and History
C
Music and Sports
D
Literature and Law
76

Catalyst does not change the?

A
Speed of reaction
B
Activation energy
C
Equilibrium position
✅
D
Reaction path
77

Designing efficient photovoltaic cells for solar panels is?

A
Science
B
Technology
✅
C
Engineering
D
Mathematics
78

If gas molecules are equal on both sides

A
pressure change?
B
Shifts left
C
Shifts right
D
Has no effect
79

The use of Carbon-14 to date ancient artifacts is part of?

A
Nuclear chemistry
✅
B
Organic chemistry
C
Inorganic chemistry
D
Physical chemistry
80

Haber process reaction is?

A
Exothermic
✅
B
Endothermic
C
Physical
D
Nuclear
81

Which branch explains the behavior of reaction rates?

A
Biochemistry
B
Analytical chemistry
C
Physical chemistry
✅
D
Inorganic chemistry
82

Reaction: N2 + 3H2 <-> 2NH3. If pressure increases

A
NH3 yield?
B
Decreases
C
Increases
D
Stays same
83

Creating practical systems for energy storage is?

A
Science
B
Technology
C
Engineering
✅
D
Philosophy
84

Acids release which ions in water?

A
OH-
B
H+
✅
C
Na+
D
Cl-
85

Pollutant analysis in air and water is studied in?

A
Environmental chemistry
✅
B
Geochemistry
C
Nuclear chemistry
D
Organic chemistry
86

Bases release which ions in water?

A
H+
B
OH-
✅
C
K+
D
Mg2+
87

The study of Earth's rocks and minerals is?

A
Geochemistry
✅
B
Biochemistry
C
Physical chemistry
D
Astrochemistry
88

The pH scale measures?

A
Density
B
Acidity or Basicity
✅
C
Mass
D
Volume
89

What helps a doctor understand drug interactions in the body?

A
History
B
Chemistry
✅
C
Geography
D
Physics
90

A pH less than 7 indicates a/an?

A
Base
B
Neutral solution
C
Acid
✅
D
Gas
91

Designing biodegradable plastics is an application of?

A
Organic chemistry
✅
B
Inorganic chemistry
C
Physical chemistry
D
Geochemistry
92

A pH of 7 indicates?

A
Strong acid
B
Strong base
C
Neutrality
✅
D
Salt
93

Which branch is vital for producing cement and fertilizers?

A
Biochemistry
B
Inorganic chemistry
✅
C
Organic chemistry
D
Nuclear chemistry
94

A pH greater than 7 indicates a/an?

A
Acid
B
Neutral solution
C
Base
✅
D
Metal
95

What is the primary study of matter's properties?

A
Physics
B
Chemistry
✅
C
Biology
D
Geology
96

Acids taste?

A
Sweet
B
Sour
✅
C
Bitter
D
Salty
97

A tree showing different branches of chemistry is a?

A
Map
B
Diagram
✅
C
Theory
D
Law
98

Bases taste?

A
Sour
B
Bitter
✅
C
Sweet
D
Salty
99

Which field deals with chemical cycles like Carbon and Nitrogen?

A
Physical chemistry
B
Environmental science
✅
C
Nuclear chemistry
D
Geochemistry
100

Acids turn blue litmus paper?

A
Green
B
Red
✅
C
Yellow
D
Blue
101

Spectroscopy and nanotechnology are tools used in?

A
Ancient history
B
Technological innovation
✅
C
Basic math
D
Sports
102

Bases turn red litmus paper?

A
Red
B
Blue
✅
C
Green
D
Yellow
103

The photoelectric effect is a concept of?

A
Science
✅
B
Technology
C
Engineering
D
Literature
104

Reaction between an acid and a base is called?

A
Oxidation
B
Reduction
C
Neutralization
✅
D
Sublimation
105

Designing catalytic converters to reduce emissions uses?

A
Nuclear chemistry
B
Environmental chemistry
✅
C
Geochemistry
D
Astrochemistry
106

Neutralization produces water and a?

A
Gas
B
Base
C
Salt
✅
D
Metal
107

Which state of matter has a definite shape and volume?

A
Liquid
B
Solid
✅
C
Gas
D
Plasma
108

Strong acids ionize?

A
Partially
B
Completely
✅
C
Not at all
D
Only when heated
109

Changing from liquid to gas is called?

A
Freezing
B
Evaporation
✅
C
Melting
D
Condensation
110

An example of a strong acid is?

A
Acetic acid
B
Hydrochloric acid (HCl)
✅
C
Citric acid
D
Formic acid
111

Which state has particles that are far apart and move freely?

A
Solid
B
Liquid
C
Gas
✅
D
Plasma
112

Acetic acid is a?

A
Strong acid
B
Weak acid
✅
C
Strong base
D
Weak base
113

Ionized gas with free electrons and ions is called?

A
Solid
B
Liquid
C
Gas
D
Plasma
✅
114

Bases feel?

A
Rough
B
Slippery
✅
C
Hot
D
Dry
115

A pure substance made of only one type of atom is a/an?

A
Mixture
B
Compound
C
Element
✅
D
Solution
116

Strong bases like NaOH dissociate?

A
Completely
✅
B
Partially
C
Not at all
D
Slowly
117

Which is an example of a compound?

A
Gold
B
Water
✅
C
Oxygen
D
Helium
118

The pH of a strong base is?

A
1
B
5
C
7
D
14
✅
119

A physical combination of two or more substances is a?

A
Element
B
Compound
C
Mixture
✅
D
Solution
120

Acid used in car batteries is?

A
Nitric acid
B
Sulfuric acid
C
Hydrochloric acid
D
Acetic acid
✅
121

The smallest unit of an element is a/an?

A
Molecule
✅
B
Atom
C
Ion
D
Compound
122

Acids react with metals to release?

A
Oxygen gas
B
Hydrogen gas
✅
C
CO2 gas
D
Nitrogen gas
123

Different structural forms of the same element are?

A
Isotopes
B
Allotropes
✅
C
Isomers
D
Polymers
124

Acids react with carbonates to release?

A
Hydrogen
B
Oxygen
C
Carbon dioxide (CO2)
✅
D
Chlorine
125

Which is an allotrope of carbon?

A
Water
B
Salt
C
Diamond
✅
D
Sand
126

A substance that can act as both an acid and a base is?

A
Basic
B
Acidic
C
Amphoteric
✅
D
Neutral
127

Graphite and Diamond differ in their?

A
Atomic mass
B
Chemical formula
C
Atomic arrangement
✅
D
Atomic number
128

Non-metal oxides (like CO2) are usually?

A
Basic
B
Acidic
✅
C
Neutral
D
Metallic
129

A homogeneous mixture is also known as a?

A
Suspension
B
Colloid
C
Solution
✅
D
Element
130

Metal oxides (like CaO) are usually?

A
Acidic
B
Basic
✅
C
Neutral
D
Inert
131

In a saltwater solution

A
salt is the?
B
Solvent
C
Solute
✅
D
Mixture
132

Which base is used in soap manufacturing?

A
HCl
B
NaOH
✅
C
NH3
D
H2SO4
133

A solution that can dissolve no more solute is?

A
Dilute
B
Concentrated
C
Saturated
✅
D
Unsaturated
134

Lime water is a solution of?

A
NaOH
B
KOH
✅
C
Ca(OH)2
D
Mg(OH)2
135

Tiny fat globules dispersed in milk make it a?

A
Solution
B
Colloid
✅
C
Suspension
D
Compound
136

Substances that turn red litmus blue are?

A
Acids
B
Bases
✅
C
Salts
D
Elements
137

Scattering of light by colloidal particles is called?

A
Tyndall effect
✅
B
Photoelectric effect
C
Greenhouse effect
D
Doppler effect
138

Citric acid is found in?

A
Stomach
B
Car batteries
C
Fruits
✅
D
Vinegar
139

Which mixture settles over time?

A
Solution
B
Colloid
C
Suspension
✅
D
Element
140

Magnesium hydroxide is commonly used as a/an?

A
Fertilizer
B
Antacid
✅
C
Fuel
D
Dye
141

Fog is an example of a?

A
Solution
B
Suspension
C
Colloid
✅
D
Compound
142

Which acid aids digestion in the stomach?

A
Sulfuric acid
B
Nitric acid
C
Hydrochloric acid
✅
D
Acetic acid
143

What is the formula of Carbon dioxide?

A
CO
B
CO2
✅
C
C2O
D
CO3
144

Ammonia (NH3) is a?

A
Strong acid
B
Weak acid
C
Strong base
D
Weak base
✅
145

Compounds require what kind of methods to separate?

A
Physical
B
Chemical
✅
C
Mechanical
D
Manual
146

Acidic oxides react with water to form?

A
Bases
B
Acids
✅
C
Salts
D
Metals
147

Air is a mixture of?

A
Elements
B
Gases
✅
C
Compounds
D
Solids
148

The strength of an acid is represented by its?

A
pH
B
Ka (dissociation constant)
✅
C
Mass
D
Volume
149

The solvent in a soda drink is usually?

A
Carbon dioxide
B
Sugar
C
Water
✅
D
Caffeine
150

Which oxide is used in carbonated drinks?

A
CaO
B
SO2
C
CO2
✅
D
MgO
151

An example of a solid dissolved in a liquid is?

A
Oxygen in water
B
Salt in water
✅
C
Oil in water
D
Sand in water
152

Baking soda is a?

A
Strong acid
B
Base (Sodium bicarbonate)
✅
C
Metal
D
Gas
153

Diamond's hardness is due to its?

A
2D structure
B
3D tetrahedral structure
✅
C
Layered structure
D
Spherical structure
154

Which allotrope of carbon is used in pencils?

A
Diamond
B
Graphite
✅
C
Fullerenes
D
Graphene
155

Particles in a suspension are?

A
Very small
B
Invisible
C
Large and heavy
✅
D
Atomic size
156

The state of matter in stars is primarily?

A
Solid
B
Liquid
C
Gas
D
Plasma
✅
157

Converting solid directly into gas is called?

A
Melting
B
Sublimation
C
Freezing
✅
D
Evaporation
158

Muddy water is an example of a?

A
Solution
B
Colloid
C
Suspension
✅
D
Compound
159

The substance in which a solute dissolves is the?

A
Solute
B
Solvent
✅
C
Mixture
D
Alloy
160

The main energy level of electrons is represented by?

A
Sub-shell
B
Shell
✅
C
Orbital
D
Nucleus
161

Subdivisions within a shell (s

A
p
B
d
C
f) are?
D
Shells
162

An atom is electrically neutral because?

A
Protons equal Neutrons
B
Protons equal Electrons
✅
C
Neutrons equal Electrons
D
It has no charge
163

How many sub-shells are in the N shell?

A
1
B
2
C
3
D
4
✅
164

Notation for the sub-shells of the M shell starts with?

A
1
B
2
C
3
✅
D
4
165

The atomic number represents the number of?

A
Neutrons
B
Protons
✅
C
Quarks
D
Positrons
166

Which principle states electrons fill lower energy orbitals first?

A
Hund's Rule
B
Aufbau Principle
✅
C
Octet Rule
D
Duplet Rule
167

The 2s orbital is lower in energy than?

A
1s
B
2s
C
2p
✅
D
1p
168

Bohr's model shows electrons move in?

A
Clouds
B
Fixed orbits
✅
C
Random paths
D
Waves
169

Potassium (Atomic No. 19) has how many electrons in the N shell?

A
8
B
2
C
1
✅
D
18
170

Atoms of the same element with different neutrons are?

A
Allotropes
B
Isotopes
✅
C
Isomers
D
Ions
171

Which isotope is used in cancer treatment?

A
Carbon-14
B
Cobalt-60
✅
C
Iodine-131
D
Uranium-235
172

Radiocarbon dating uses which isotope?

A
Carbon-12
B
Carbon-13
C
Carbon-14
✅
D
Uranium-238
173

The mass number is the sum of?

A
Protons and Electrons
B
Protons and Neutrons
✅
C
Neutrons and Electrons
D
Protons only
174

Who discovered the electron?

A
J.J. Thomson
✅
B
Ernest Rutherford
C
John Dalton
D
Niels Bohr
175

The dense

A
positive center of an atom is the?
B
Electron
C
Proton
D
Nucleus
176

Which subatomic particle has no charge?

A
Proton
B
Electron
C
Neutron
✅
D
Positron
177

The weighted average mass of isotopes is?

A
Atomic number
B
Relative atomic mass
✅
C
Mass number
D
Formula mass
178

The atomic mass unit (amu) is based on?

A
Hydrogen-1
B
Oxygen-16
C
Carbon-12
✅
D
Nitrogen-14
179

Cations are formed when an atom?

A
Gains electrons
B
Loses electrons
✅
C
Gains protons
D
Loses neutrons
180

Anions are formed when an atom?

A
Gains electrons
✅
B
Loses electrons
C
Gains protons
D
Loses neutrons
181

The electronic configuration of Carbon (Atomic No. 6) is?

A
1s2 2s2 2p2
✅
B
1s2 2s2 2p4
C
1s2 2s2 2p6
D
1s2 2s1
182

How many electrons can the p sub-shell hold?

A
2
B
6
✅
C
10
D
14
183

The first subatomic particle discovered was?

A
Proton
B
Neutron
C
Electron
✅
D
Quark
184

Who proposed that atoms are indivisible particles?

A
Dalton
B
Rutherford
✅
C
Thomson
D
Bohr
185

Spectral lines of multi-electron atoms could not be explained by?

A
Quantum model
B
Bohr model
✅
C
Dalton model
D
Thomson model
186

Modern model describes electrons in regions called?

A
Orbits
B
Orbitals
✅
C
Shells
D
Rings
187

Chlorine-35 and Chlorine-37 are examples of?

A
Allotropes
B
Isotopes
✅
C
Compounds
D
Ions
188

Valence electrons are found in the?

A
Inner shell
B
Outermost shell
✅
C
Nucleus
D
d-orbital
189

Which isotope is used as fuel in nuclear reactors?

A
Cobalt-60
B
Iodine-131
C
Uranium-235
✅
D
Carbon-14
190

The charge of a proton is?

A
-1
B
0
C
+1
✅
D
+2
191

Who developed the first periodic table?

A
Dalton
B
Mendeleev
C
Rutherford
✅
D
Thomson
192

Groups in the periodic table are?

A
Horizontal rows
B
Vertical columns
✅
C
Diagonal lines
D
Circular rings
193

Periods in the periodic table represent the number of?

A
Valence electrons
B
Protons
C
Electron shells
✅
D
Neutrons
194

Group 1 elements are known as?

A
Alkaline earth metals
B
Halogens
C
Noble gases
D
Alkali metals
✅
195

Halogens belong to which group?

A
Group 1
B
Group 2
C
Group 17
✅
D
Group 18
196

Which group contains the noble gases?

A
Group 1
B
Group 17
C
Group 18
✅
D
Group 2
197

Atomic radius across a period (left to right)?

A
Increases
B
Decreases
✅
C
Stays same
D
Doubles
198

The energy required to remove an electron is?

A
Electron affinity
B
Ionization energy
✅
C
Electronegativity
D
Bond energy
199

The ability of an atom to attract shared electrons is?

A
Ionization energy
B
Electronegativity
✅
C
Electron affinity
D
Valency
200

Metallic character down a group?

A
Increases
✅
B
Decreases
C
Stays same
D
Disappears
201

Which element is the most electronegative?

A
Oxygen
B
Fluorine
✅
C
Chlorine
D
Nitrogen
202

Transition metals are found in which block?

A
s-block
B
p-block
C
d-block
✅
D
f-block
203

Lanthanides and Actinides belong to which block?

A
s-block
B
p-block
C
d-block
D
f-block
✅
204

Group 1 elements form ions with charge?

A
-1
B
+1
✅
C
+2
D
0
205

Noble gases are unreactive because they have?

A
No electrons
B
Full outer shell
✅
C
High mass
D
Many neutrons
206

The distance from nucleus to outermost electron is?

A
Atomic number
B
Atomic radius
✅
C
Mass number
D
Valency
207

Elements with atomic numbers 57 to 71 are?

A
Actinides
B
Halogens
C
Lanthanides
✅
D
Noble gases
208

Which halogen is the most reactive?

A
Iodine
B
Bromine
C
Chlorine
D
Fluorine
✅
209

Helium is used in balloons because it is?

A
Flammable
B
Lighter than air
✅
C
Reactive
D
Heavy
210

Metals are good conductors because they have?

A
Fixed electrons
B
Free-moving electrons
✅
C
No electrons
D
Protons
211

Non-metals are generally?

A
Shiny
B
Malleable
C
Brittle
✅
D
Ductile
212

Elements in the same group have the same number of?

A
Shells
B
Valence electrons
✅
C
Protons
D
Neutrons
213

The d-block elements are also called?

A
Main group elements
B
Transition elements
✅
C
Halogens
D
Alkali metals
214

Electron affinity across a period?

A
Increases
✅
B
Decreases
C
Stays same
D
Decreases then increases
215

Which metal is the most malleable?

A
Iron
B
Gold
✅
C
Copper
D
Platinum
216

The +2 charge is characteristic of which group?

A
Group 1
B
Group 2
✅
C
Group 17
D
Group 18
217

Elements that show properties of both metals and non-metals are?

A
Halogens
B
Metalloids
✅
C
Alkali metals
D
Noble gases
218

Atomic radius down a group?

A
Increases
✅
B
Decreases
C
Stays same
D
First increases then decreases
219

Which block contains Groups 1 and 2?

A
s-block
✅
B
p-block
C
d-block
D
f-block
220

Modern periodic table is arranged by increasing?

A
Atomic mass
B
Atomic number
✅
C
Neutron number
D
Valency
221

The vertical columns 3 to 12 contain?

A
Alkali metals
B
Transition metals
✅
C
Noble gases
D
Halogens
222

Which element has the highest ionization energy?

A
Francium
B
Helium
✅
C
Lithium
D
Fluorine
223

Atoms react to achieve how many electrons in their valence shell?

A
2
B
4
C
6
D
8
✅
224

The tendency to achieve 8 electrons is called?

A
Duplet rule
B
Octet rule
✅
C
Aufbau principle
D
Hund's rule
225

Ionic bonds involve the?

A
Sharing of electrons
B
Transfer of electrons
✅
C
Sea of protons
D
Neutrons
226

Covalent bonds involve the?

A
Sharing of electrons
✅
B
Transfer of electrons
C
Loss of protons
D
Magnetic force
227

Bond formed between a metal and a non-metal is usually?

A
Covalent
B
Ionic
✅
C
Metallic
D
Hydrogen
228

Which molecule contains a triple covalent bond?

A
H2
B
O2
C
N2
✅
D
HCl
229

Water (H2O) has which type of bonding?

A
Ionic
B
Covalent
✅
C
Metallic
D
None
230

The attraction between metal cations and a sea of electrons is?

A
Ionic bond
B
Covalent bond
C
Metallic bond
✅
D
Hydrogen bond
231

Which bond is the strongest?

A
Ionic
B
Covalent
✅
C
Metallic
D
Van der Waals
232

Weak forces of attraction between molecules are?

A
Ionic bonds
B
Intermolecular forces
✅
C
Nuclear forces
D
Covalent bonds
233

Strongest intermolecular force involving Hydrogen is?

A
London forces
B
Dipole-dipole
C
Hydrogen bonding
✅
D
Covalent bond
234

Molecules that have unequal sharing of electrons are?

A
Non-polar
B
Polar
✅
C
Ionic
D
Inert
235

Which property is unique to metals?

A
Brittleness
B
Malleability
✅
C
Low boiling point
D
Insulator
236

Ionic compounds conduct electricity in?

A
Solid state
B
Molten or aqueous state
✅
C
Any state
D
Never
237

The energy required to break a chemical bond is?

A
Activation energy
B
Bond energy
✅
C
Lattice energy
D
Kinetic energy
238

Which molecule exhibits hydrogen bonding?

A
CH4
B
CO2
C
H2O
✅
D
NaCl
239

In a double covalent bond

A
how many electron pairs are shared?
B
1
C
2
D
3
240

Which compound is an example of an ionic bond?

A
HCl
B
CO2
C
NaCl
✅
D
CH4
241

Hydrogen bonding occurs between Hydrogen and?

A
Carbon
B
Oxygen
✅
C
Sodium
D
Iron
242

Metallic bonds allow metals to be?

A
Brittle
B
Ductile
✅
C
Soft
D
Transparent
243

Intermolecular forces affect a substance's?

A
Atomic number
B
Boiling point
✅
C
Valency
D
Radioactivity
244

Non-polar molecules are held by?

A
Hydrogen bonds
✅
B
London dispersion forces
C
Ionic bonds
D
Metallic bonds
245

The bond between two identical non-metal atoms is?

A
Polar
B
Non-polar
✅
C
Ionic
D
Metallic
246

Which type of bond holds DNA strands together?

A
Ionic
B
Covalent
C
Hydrogen
✅
D
Metallic
247

Electronegativity difference determines?

A
Bond type
✅
B
Atomic mass
C
Number of shells
D
Number of neutrons
248

Metals reflect light due to?

A
Protons
B
Free electrons
✅
C
Fixed nucleus
D
Neutrons
249

Ionic compounds generally have?

A
Low melting points
B
High melting points
✅
C
No melting points
D
Liquid state at RT
250

Single covalent bonds share how many electrons total?

A
1
B
2
✅
C
3
D
4
251

A bond formed by delocalized electrons is?

A
Covalent
B
Ionic
C
Metallic
✅
D
Polar
252

Water has a high boiling point due to?

A
Ionic bonds
B
Hydrogen bonding
✅
C
Small size
D
Triple bonds
253

Which molecule is non-polar?

A
H2O
B
HCl
C
O2
✅
D
NH3
254

Copper is used in wiring due to its?

A
Low cost
B
High electrical conductivity
✅
C
Color
D
Brittleness
255

The simplest whole-number ratio of atoms in a compound is?

A
Molecular formula
B
Empirical formula
✅
C
Structural formula
D
Chemical formula
256

The actual number of atoms in a molecule is the?

A
Empirical formula
B
Molecular formula
✅
C
Structural formula
D
Atomic ratio
257

The empirical formula of Glucose (C6H12O6) is?

A
C6H12O6
B
CHO
C
CH2O
✅
D
C3H6O3
258

Molecular mass is the sum of atomic masses in a?

A
Molecule
✅
B
Ionic lattice
C
Atom
D
Proton
259

The term "formula mass" is used for?

A
Covalent compounds
B
Ionic compounds
✅
C
Elements
D
Gases
260

Molecular mass of Water (H2O) is?

A
16 u
B
18 u
✅
C
20 u
D
10 u
261

Avogadro's number is equal to?

A
3.14 x 10^23
B
6.022 x 10^23
✅
C
9.81 x 10^23
D
1.66 x 10^23
262

One mole of any substance contains how many particles?

A
1 x 10^23
B
6.022 x 10^23
✅
C
12
D
100
263

Molar mass of CO2 is?

A
28 g/mol
B
44 g/mol
✅
C
32 g/mol
D
18 g/mol
264

Formula to calculate moles is?

A
Mass x Molar Mass
B
Mass / Molar Mass
✅
C
Mass + Molar Mass
D
Molar Mass / Mass
265

How many moles are in 36 g of water?

A
1
B
2
✅
C
3
D
4
266

Percentage composition represents?

A
Volume of gas
B
Percentage by mass of each element
✅
C
Number of protons
D
Bond strength
267

Chemical equations must be balanced to obey?

A
Law of Gravity
B
Law of Conservation of Mass
✅
C
Octet Rule
D
Hund's Rule
268

In the reaction 2H2 + O2 -> 2H2O

A
the coefficient of H2 is?
B
1
C
2
D
3
269

The molecular formula of Ethane is?

A
CH4
B
C2H6
✅
C
C2H4
D
C3H8
270

A formula showing the arrangement of atoms is?

A
Empirical
B
Molecular
C
Structural
✅
D
Atomic
271

Combustion of methane produces?

A
Oxygen and Water
B
CO2 and Water
✅
C
Nitrogen and CO2
D
Hydrogen
272

The number of atoms in 23 g of Sodium (Na) is?

A
1
B
6.022 x 10^23
✅
C
12 x 10^23
D
23
273

Mass of 1 mole of Hydrogen atoms is?

A
1 g
✅
B
2 g
C
16 g
D
4 g
274

Mass of 1 mole of Hydrogen molecules (H2) is?

A
1 g
B
2 g
✅
C
16 g
D
4 g
275

What is the formula mass of NaCl?

A
23 u
B
35.5 u
C
58.5 u
✅
D
100 u
276

One mole of Carbon-12 weighs exactly?

A
6 g
B
12 g
✅
C
1 g
D
24 g
277

The ratio of atoms in the empirical formula is always?

A
Decimal
B
Whole-number
✅
C
Negative
D
Fraction
278

Benzene (C6H6) has the empirical formula?

A
CH
✅
B
CH2
C
C2H2
D
C6H6
279

Calculating the mass of each element in a compound is?

A
Balancing
B
Stoichiometry
C
Percentage composition
✅
D
Oxidation
280

Binary ionic compounds consist of?

A
Two metals
B
Two non-metals
C
One metal and one non-metal
✅
D
Noble gases
281

Naming rule for binary ionic compounds ends the non-metal with?

A
-ous
B
-ic
C
-ide
✅
D
-ate
282

Molar mass of MgO is?

A
24 g/mol
B
16 g/mol
C
40 g/mol
✅
D
56 g/mol
283

Avogadro's number relates the microscopic scale to?

A
Meters
B
Grams
✅
C
Seconds
D
Amperes
284

The unit of atomic mass (u) is also called?

A
kg
B
amu
✅
C
mol
D
g
285

Loss of electrons is called?

A
Reduction
B
Oxidation
✅
C
Neutralization
D
Combustion
286

Gain of electrons is called?

A
Oxidation
B
Reduction
✅
C
Hydration
D
Sublimation
287

The apparent charge of an atom in a compound is its?

A
Valency
B
Atomic number
C
Oxidation state
✅
D
Mass number
288

Reducing agent is a substance that?

A
Gains electrons
B
Loses electrons
✅
C
Gains protons
D
Remains unchanged
289

Oxidizing agent is a substance that?

A
Gains electrons
✅
B
Loses electrons
C
Loses protons
D
Releases energy
290

In a neutral compound

A
the sum of oxidation states is?
B
+1
C
-1
D
0
291

The oxidation state of free elements (like O2) is?

A
-2
B
+1
C
0
✅
D
-1
292

The oxidation state of Oxygen in most compounds is?

A
-1
B
-2
✅
C
0
D
+2
293

In peroxides

A
the oxidation state of Oxygen is?
B
-2
C
-1
D
0
294

The oxidation state of Hydrogen in metal hydrides (like NaH) is?

A
+1
B
0
C
-1
✅
D
+2
295

Rusting of iron is which type of reaction?

A
Displacement
B
Neutralization
C
Redox
✅
D
Decomposition
296

Corrosion is the gradual deterioration of metals due to?

A
Reduction
B
Oxidation
✅
C
Heating
D
Cooling
297

Coating iron with zinc to prevent rust is?

A
Galvanization
B
Electroplating
✅
C
Alloying
D
Painting
298

A sacrificial anode is usually made of?

A
Gold
B
Silver
C
Zinc
✅
D
Copper
299

In the reaction CuO + H2 -> Cu + H2O

A
the reducing agent is?
B
CuO
C
H2
D
Cu
300

Oxidation number of Chromium in H2CrO4 is?

A
+4
B
+5
C
+6
✅
D
+3
301

Food cans are often plated with which metal?

A
Zinc
B
Tin
✅
C
Lead
D
Silver
302

The black layer on tarnished silver is?

A
Silver oxide
B
Silver sulfide
✅
C
Silver chloride
D
Pure silver
303

Copper forms a green layer called?

A
Rust
B
Patina
✅
C
Slag
D
Alloy
304

Corrosion requires both moisture and?

A
Nitrogen
B
Hydrogen
C
Oxygen
✅
D
Helium
305

Stainless steel is an alloy of Iron and?

A
Zinc
B
Magnesium
C
Chromium
✅
D
Sodium
306

The oxidation state of Nitrogen in NH3 is?

A
+3
B
-3
✅
C
0
D
+5
307

The sum of oxidation states in a polyatomic ion equals?

A
Zero
B
The ion's charge
✅
C
+1
D
-1
308

An oxidizing agent itself gets?

A
Oxidized
B
Reduced
✅
C
Neutralized
D
Vaporized
309

During reduction

A
the oxidation number?
B
Increases
✅
C
Decreases
D
Stays same

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