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chemistry MCQs

11th • Chapter 10

50 Questions TextBook
1

What is the oxidation number of an element in its free state, such as Na or H₂?

A
+1
B
-1
C
0
D
+2
2

The oxidation number of oxygen in peroxides like H₂O₂ is:

A
-2
B
-1
C
+2
D
-1/2
3

In the compound KMnO₄, what is the oxidation state of Manganese (Mn)?

A
+2
B
+5
C
+7
D
+4
4

During the electrolysis of molten NaCl, what is produced at the cathode?

A
Chlorine gas
B
Sodium metal
C
Oxygen gas
D
Hydrogen gas
5

A process that involves the conversion of chemical energy into electrical energy occurs in a:

A
Electrolytic cell
B
Down's cell
C
Nelson's cell
D
Galvanic cell
6

In an electrolytic cell, the electrode connected to the positive terminal of the battery is called:

A
Cathode
B
Anode
C
Salt bridge
D
Voltmeter
7

What process occurs at the anode in an electrochemical cell?

A
Reduction
B
Oxidation
C
Neutralization
D
Sublimation
8

The standard electrode potential of the Standard Hydrogen Electrode (SHE) is arbitrarily set to:

A
1.00 V
B
0.76 V
C
0.34 V
D
0.00 V
9

In the electrochemical series, elements with large negative reduction potentials are strong:

A
Oxidizing agents
B
Reducing agents
C
Acids
D
Bases
10

The lead-acid battery, commonly used in cars, is an example of a:

A
Primary cell
B
Secondary cell
C
Fuel cell
D
Dry cell
11

What is the electrolyte used in a lead-acid accumulator?

A
Potassium hydroxide
B
Hydrochloric acid
C
Sulphuric acid solution
D
Sodium chloride solution
12

In a dry alkaline battery, the anode is made of:

A
Manganese dioxide
B
Zinc
C
Carbon
D
Silver oxide
13

The voltage of a silver oxide battery is approximately:

A
1.2 V
B
2.0 V
C
1.5 V
D
1.4 V
14

What is the cathode material in a Nickel-Cadmium (Ni-Cd) cell?

A
Cadmium
B
Nickel oxide (NiO₂)
C
Zinc
D
Lead oxide
15

Fuel cells convert the chemical energy of fuels like hydrogen and oxygen directly into:

A
Heat energy
B
Light energy
C
Mechanical energy
D
Electrical energy
16

The apparent charge on an atom of an element in a molecule or ion is called:

A
Valency
B
Ionic charge
C
Oxidation number
D
Atomic number
17

In the ion-electron method for balancing equations in an acidic medium, oxygen atoms are balanced by adding:

A
OH⁻ ions
B
H⁺ ions
C
H₂O molecules
D
Electrons
18

The process where a non-spontaneous reaction is driven by an electric current is called:

A
Galvanization
B
Electrolysis
C
Corrosion
D
Hydrolysis
19

In the Zn-Cu galvanic cell, the salt bridge is typically filled with an aqueous solution of:

A
ZnSO₄
B
CuSO₄
C
H₂SO₄
D
KCl
20

Which metal can displace Copper (Cu) from a CuSO₄ solution according to the electrochemical series?

A
Silver (Ag)
B
Gold (Au)
C
Zinc (Zn)
D
Platinum (Pt)
21

Anodized aluminium is prepared by making aluminium the anode in an electrolytic cell containing:

A
Hydrochloric acid
B
Molten cryolite
C
Sulphuric or chromic acid
D
Caustic soda
22

In the Hall-Beroult process, aluminium is extracted by electrolyzing fused bauxite in the presence of:

A
Anhydrous CaCl₂
B
Fused cryolite (Na₃AlF₆)
C
Graphite powder
D
Sulphuric acid
23

The standard reduction potential of Zn is -0.76 V. What is its standard oxidation potential?

A
-0.76 V
B
+0.76 V
C
0.00 V
D
-1.52 V
24

During the discharging of a lead accumulator, what substance is formed on both the anode and cathode?

A
Pb
B
PbO₂
C
PbSO₄
D
H₂SO₄
25

What is the voltage of a single cell in a fully charged lead accumulator?

A
1.5 V
B
12 V
C
6 V
D
2 V
26

In the electrolysis of aqueous NaCl solution, which gas is produced at the anode?

A
Hydrogen
B
Oxygen
C
Chlorine
D
Nitrogen
27

Which of the following metals is the most reactive according to the electrochemical series?

A
Cu
B
Ag
C
Li
D
Fe
28

The electrode at which reduction occurs is called the:

A
Anode
B
Cathode
C
Electrolyte
D
Salt Bridge
29

Which statement is correct for a voltaic cell?

A
Oxidation occurs at the cathode
B
Reduction occurs at the anode
C
The anode is negatively charged
D
It uses electrical energy
30

The purpose of a salt bridge in a galvanic cell is to:

A
Allow electron flow
B
Prevent charge accumulation
C
Separate the electrodes
D
Provide reactants
31

In the electrolysis of water, what is the volume ratio of hydrogen gas to oxygen gas produced?

A
1:2
B
2:1
C
1:1
D
1:3
32

When a cell operates as a voltaic cell, reduction occurs at the:

A
Anode
B
Cathode
C
Positive electrode
D
Negative electrode
33

Which of the following is a primary cell?

A
Lead-acid battery
B
Ni-Cd battery
C
Alkaline battery
D
Fuel cell
34

In a silver oxide battery, the cathode is made of:

A
Zinc
B
Silver oxide (Ag₂O)
C
Graphite
D
Cadmium
35

The voltage of a Nickel-Cadmium cell is about:

A
1.5 V
B
2.0 V
C
1.4 V
D
1.1 V
36

The electrolyte in a fuel cell like the Hydrogen-Oxygen fuel cell is typically:

A
HCl
B
H₂SO₄
C
NaCl
D
KOH
37

The process where an ionic compound in a fused state splits into charged particles is called:

A
Electrolysis
B
Ionization
C
Dissociation
D
Conduction
38

What is the product at the anode during the electrolysis of molten PbBr₂?

A
Lead (Pb)
B
Bromine gas (Br₂)
C
Oxygen (O₂)
D
Hydrogen (H₂)
39

Which cell is used for the commercial extraction of sodium metal?

A
Nelson's cell
B
Galvanic cell
C
Down's cell
D
Lead accumulator
40

The oxidation number of Cr in K₂Cr₂O₇ is:

A
+3
B
+6
C
+7
D
+2
41

A cell that can be recharged is called a:

A
Primary cell
B
Voltaic cell
C
Secondary cell
D
Disposable cell
42

In the Zn-Cu cell, the standard cell potential (E°) is:

A
0.76 V
B
0.34 V
C
1.10 V
D
-1.10 V
43

Which of the following metals does NOT liberate hydrogen gas from dilute acids?

A
Zn
B
Mg
C
Ca
D
Cu
44

What happens to the density of the H₂SO₄ electrolyte when a lead-acid battery is discharging?

A
Increases
B
Decreases
C
Remains constant
D
Becomes zero
45

The balancing of redox equations by the ion-electron method retains only the:

A
Spectator ions
B
Essential ions
C
Neutral molecules
D
Solid precipitates
46

What is the function of platinum black on the platinum foil in a SHE?

A
To act as a catalyst
B
To provide a large surface area
C
To conduct electricity
D
All of the above
47

In a voltaic cell, electrons flow from:

A
Anode to Cathode through the solution
B
Cathode to Anode through the external circuit
C
Anode to Cathode through the external circuit
D
Cathode to Anode through the solution
48

The oxidation number of Hydrogen in metal hydrides (e.g., NaH) is:

A
+1
B
-1
C
0
D
+2
49

Caustic soda (NaOH) is commercially prepared using which cell?

A
Down's cell
B
Nelson's cell
C
Hall-Beroult cell
D
Daniell cell
50

A reaction with an overall positive E°cell value is considered to be:

A
Non-spontaneous
B
Spontaneous
C
At equilibrium
D
Reversible