Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 6

EASY

12th Odisha Board

IMPORTANT

Earn 100

Explain why rusting of iron is faster in saline water than in ordinary water. Write equations.

Important Questions on Electrochemistry

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 7

An electronic current is passed through two solutions (a)

{AgNO}_{3}

and (b) a solution of

10 g

of blue vitriol in

500 ml

of water using platinum electrodes separately. After

30 \min

. it was found that

1.307 g Ag

was deposited. What is the concentration of

{Cu}^{2 +}

after electrolysis ?

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 8

A current of

1.7

amp is passed through

300 mL

of

0.16 M {ZnSO}_{4}

solution for

230

seconds with a current efficiency of

90 %

. Find the concentration of divalent zinc in solution.

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 9

The standard potential of

{Ni}^{2 +} / Ni

is

- 0.236 V

. If this electrode is coupled with a hydrogen electrode, the emf of the cell becomes zero. Calculate the

pH

of the acid used in electrode.

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 10

E °

values for

{Fe}^{3 +} + 3 e^{-} \to Fe

and

{Fe}^{2 +} + 2 e^{-} \to Fe

are

- 0.036 V

and

- 0.44 V

respectively. Calculate

E °

and

∆ G °

for the cell reaction

Fe + 2 {Fe}^{3 +} \to 3 {Fe}^{2 +}

.

EASY

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 11

When salt spread on road to melt ice and snow during winter, corrosion of motor cars is a major problem, justify.

MEDIUM

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 12

E °

of

Ag

electrode is

0.8 V

and solubility product of

AgI

is

1 \times 10^{- 16}

. Calculate the potential of

Ag

electrode at

25 ° C

in a saturated

AgI

solution in water.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 1

State and explain Faraday's laws of electrolysis. How many grams of Aluminium can be produced by the electrolysis of molten alumina with a current of

3

amperes for

10

minutes.

HARD

12th Odisha Board

IMPORTANT

Bureau's Higher Secondary Chemistry Volume-2>Chapter 3 - Electrochemistry>QUESTIONS>Q 2

Define and explain equivalent conductance and specific conductance. A

0.1 N

solution of

NaCl

has a specific conductance of

0.00119 mhos {cm}^{- 1}

. Find its equivalent conductance.