Unit#4: Electrochemistry

1

The unit of electrode potential is:

A Ampere B Volt C Ohm D Watt

2

An electrochemical cell converts chemical energy into:

A Heat energy B Mechanical energy C Electrical energy D Nuclear energy

3

Electroplating is used to:

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

4

The main advantage of fuel cells is that they are:

A Polluting B Noisy C Environment friendly D Expensive

5

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

A Produce electrons B Complete the circuit C Increase voltage D Stop oxidation

6

Which reaction occurs at the anode of a Daniell cell?

A Reduction of Cu²⁺ B Oxidation of Zn C Reduction of Zn²⁺ D Oxidation of Cu

7

During electrolysis, the electrode connected to positive terminal is:

A Cathode B Anode C Salt bridge D Electrolyte

8

In electrolysis of aqueous NaCl, hydrogen is released at:

A Anode B Cathode C Salt bridge D Electrolyte

9

Electrolysis of molten compounds is preferred because:

A Water interferes B Electricity is cheap C It gives less product D Reaction is spontaneous

10

Which device directly converts chemical energy to electrical energy?

A Generator B Motor C Battery D Transformer

11

Which ion migrates through the salt bridge?

A Metal ions only B Electrons C Positive and negative ions D Neutrons

12

The electrode where reduction occurs is called:

A Anode B Electrolyte C Cathode D Salt bridge

13

Halide compounds are electrolyzed mainly to obtain:

A Acids B Metals and halogens C Bases D Salts

14

The electrical chemical series arranges elements according to:

A Atomic number B Atomic mass C Standard electrode potential D Valency

15

Electrochemical series helps to predict:

A Color of metal B Density of metal C Displacement reactions D Melting point

16

In electroplating using the same electrode, the anode is:

A Inert B The metal to be deposited C Plastic rod D Carbon rod

17

A fuel cell produces electricity by:

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

18

In a galvanic cell, electrons flow from:

A Cathode to anode B Anode to cathode C Salt bridge to electrodes D Electrolyte to electrodes

19

A lead-acid battery is commonly used in:

A Watches B Mobile phones C Cars D Torches

20

Oxidation is defined as:

A Gain of electrons B Loss of electrons C Gain of protons D Loss of neutrons

21

A metal higher in electrochemical series is:

A Less reactive B More reactive C Neutral D Non-metal

22

Electrolysis reactions are:

A Spontaneous B Exothermic only C Non-spontaneous D Nuclear

23

In electrolysis, electrons are supplied by:

A Electrolyte B Electrodes C External power source D Salt bridge

24

In a Daniell cell, zinc electrode acts as:

A Cathode B Anode C Electrolyte D Salt bridge

25

Which metal is most reactive according to electrochemical series?

A Copper B Iron C Zinc D Potassium