Live Education Quiz

1

Corrosion is an undesirable process because it:

A Improves metal quality B Increases conductivity C Damages metals D Prevents oxidation

2

Electrons flow in an external circuit from:

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

3

Oxidation number of oxygen in most compounds is:

A 0 B -1 C -2 D +2

4

Which material is commonly used as electrolyte in electroplating?

A Distilled water B Molten metal C Salt solution of plating metal D Pure acid

5

An oxidizing agent is a substance that:

A Loses electrons B Gains electrons C Gives electrons to others D Prevents oxidation

6

Corrosion mainly affects:

A Non-metals B Metalloids C Metals D Noble gases

7

Which cell is responsible for corrosion?

A Dry cell B Electrolytic cell C Corrosion cell D Fuel cell

8

Which battery is rechargeable?

A Dry cell B Button cell C Lead-acid battery D Mercury cell

9

A voltaic cell is also known as:

A Electrolytic cell B Dry cell C Galvanic cell D Fuel cell

10

Rusting of iron is an example of:

A Reduction only B Oxidation only C Redox reaction D Neutralization

11

Which species is reduced in the reaction Zn + Cu2+ → Zn2+ + Cu?

A Zn B Cu2+ C Zn2+ D Cu

12

Which metal is commonly used for sacrificial protection of iron?

A Copper B Silver C Zinc D Gold

13

Which component maintains electrical neutrality in a voltaic cell?

A Anode B Cathode C Salt bridge D Electrolyte

14

Which statement best describes a redox reaction?

A Only oxidation occurs B Only reduction occurs C Oxidation and reduction occur together D No electron transfer occurs

15

Sacrificial protection uses:

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

16

Which substance is necessary for rusting of iron?

A Nitrogen B Carbon dioxide C Water and oxygen D Hydrogen

17

Which reaction shows reduction?

A Fe → Fe2+ + 2e− B Cl− → Cl + e− C Cu2+ + 2e− → Cu D Zn → Zn2+ + 2e−

18

Electrochemistry mainly deals with:

A Heat and energy B Electricity and chemical reactions C Light and atoms D Pressure and volume

19

Which reaction involves transfer of electrons?

A Acid-base reaction B Precipitation reaction C Redox reaction D Neutralization reaction

20

Reduction takes place at the:

A Anode B Electrolyte C Cathode D Salt bridge

21

Which of the following is an example of oxidation?

A Zn → Zn2+ + 2e− B Cu2+ + 2e− → Cu C Cl2 + 2e− → 2Cl− D O2 + 4e− → 2O2−

22

What is the oxidation state of Cl in NaCl?

A +1 B 0 C -1 D -2

23

The electrolyte in an electrochemical cell is:

A A metal B A conductor of electrons C A solution that conducts ions D An insulator

24

Which type of cell requires an external power source?

A Voltaic cell B Galvanic cell C Electrolytic cell D Dry cell

25

In corrosion, iron acts as:

A Cathode only B Anode only C Both anode and cathode D Electrolyte

26

Reduction is defined as:

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

27

Oxidation is the process of:

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

28

Which of the following is an application of electrochemistry?

A Distillation B Electrolysis C Filtration D Evaporation

29

Which of the following is NOT a method to prevent corrosion?

A Painting B Galvanization C Electroplating D Rusting

30

The anode in a galvanic cell is:

A Positively charged B Negatively charged C Neutral D Insulated

Chem – Chapter 7: Electrochemistry