Unit#3: Stoichiometry + Unit#4: Electrochemistry

1

Which yield is always less than or equal to theoretical yield?

A Actual yield B Percentage yield C Limiting yield D Maximum yield

2

Fuel cells are widely used in:

A Clocks B Spacecraft C Torches D Radios

3

A fuel cell produces electricity by:

A Burning fuel directly B Electrochemical reaction C Nuclear reaction D Photosynthesis

4

Which metal is commonly electroplated on iron to prevent rusting?

A Copper B Silver C Zinc D Gold

5

Which of the following is used to prepare a dilute solution from a concentrated one?

A Evaporation B Distillation C Dilution D Filtration

6

Which term refers to the calculated amount of product?

A Actual yield B Percentage yield C Theoretical yield D Limiting yield

7

In electrolysis, reduction takes place at:

A Anode B Cathode C Electrolyte D Battery

8

Which of the following is a secondary cell?

A Dry cell B Fuel cell C Lead-acid battery D Daniell cell

9

The unit of molarity is:

A mol/kg B g/L C mol/L D g/mol

10

Electroplating is used to:

A Purify metals B Extract metals C Coat one metal with another D Produce electricity

11

Which quantity is used to compare reactants in a balanced equation?

A Mass ratio B Volume ratio C Mole ratio D Density ratio

12

Which substance acts as oxidizing agent in Daniell cell?

A Zinc B Copper C Cu²⁺ ions D Zn²⁺ ions

13

Percentage yield is calculated using which formula?

A (Actual/Theoretical) × 100 B (Theoretical/Actual) × 100 C Actual + Theoretical D Actual − Theoretical

14

The amount of product formed depends on:

A Excess reactant B Limiting reactant C Temperature only D Pressure only

15

Which concentration unit depends on volume?

A Strength B Molarity C Mass percent D Mole fraction

16

Hydrogen-oxygen fuel cell uses:

A Hydrogen as oxidant B Oxygen as fuel C Hydrogen as fuel D Water as fuel

17

Which unit is commonly used for strength?

A mol/L B g/L C g/mol D mol/kg

18

The unit of electrode potential is:

A Ampere B Volt C Ohm D Watt

19

The amount of substance is directly proportional to:

A Volume B Mass C Number of particles D Density

20

Dilution of a solution involves:

A Adding solute B Removing solute C Adding solvent D Heating solution

21

A battery is a device that:

A Stores electrical energy B Produces heat energy C Consumes electricity D Produces light only

22

Which reactant remains unconsumed after reaction completion?

A Limiting reactant B Catalyst C Non-limiting reactant D Product

23

One mole of any substance contains how many particles?

A 6.02 × 10^22 B 6.02 × 10^21 C 6.02 × 10^23 D 6.02 × 10^24

24

Which quantity remains unchanged during dilution?

A Volume B Molarity C Moles of solute D Strength

25

Mole is a unit related to:

A Mass B Volume C Number of particles D Density