Electrochemistry Quiz

1

Electrochemistry is the branch of physical chemistry which deals with the relationship between:

Electrical energy and chemical changes in redox reactions Thermal energy and chemical reactions Mechanical energy and ionic movement Nuclear energy and electrolysis

2

The electrode on which oxidation takes place is called:

Cathode Anode Both Neither

3

In a voltameter, for the cell: E_cell = ___ and ΔG = ___

+ve, +ve +ve, –ve –ve, +ve –ve, –ve

4

According to preferential discharge theory, which ion is discharged first?

Ion with highest discharge potential Ion with lowest discharge potential Ion with highest concentration Ion with largest size

5

In electrolysis of aqueous NaCl with Pt electrodes, the product at cathode is:

Na Cl₂ H₂ O₂

6

Faraday's first law states that mass deposited is proportional to:

1/I 1/t Q (It) 1/Q

7

1 Faraday is equal to:

965 C 96,500 C 9,650 C 96,500,000 C

8

Electrochemical equivalent Z =

E/F F/E E×F F-E

9

In metallic conduction, conductivity ___ with increase in temperature.

Increases Decreases Remains same First increases then decreases

10

Unit of molar conductivity is:

S cm⁻¹ S cm² mol⁻¹ S⁻¹ cm² mol Ohm cm

11

For strong electrolytes, molar conductivity ___ with dilution.

Decreases sharply Increases slightly Remains constant First increases then decreases

12

Transport number of an ion is:

Total current / Current by ion Current by ion / Total current Speed of ion / Total speed Mass of ion / Total mass

13

Kohlrausch's law is applicable at:

High concentration Infinite dilution Moderate concentration Zero concentration

14

In electrolysis of aqueous CuSO₄ with Cu electrodes, anode undergoes:

Reduction Oxidation to Cu²⁺ No change Deposition of Cu

15

The process of coating inferior metal with superior metal by electrolysis is:

Electrorefining Electrosynthesis Electroplating Electrometallurgy

16

1 Faraday reduces how many moles of monovalent cation?

1/2 mole 1 mole 2 moles 1/96500 mole

17

Conductance is measured in:

Ohm Siemens Farad Coulomb

18

For weak electrolytes, degree of dissociation α =

Λ / Λ° Λ° / Λ Λ × Λ° 1/Λ

19

In electrolytic conduction, transfer of matter occurs in the form of:

Electrons Ions Atoms Molecules

20

The sum of transport numbers of cation and anion is:

0 1 0.5 2