Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 22

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On electrolysing a solution of dilute $H_{2} {SO}_{4}$ between platinum electrodes, the gas evolved at the anode is:

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Important Questions on Electrochemistry

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 23

The concentration of

{Cu}^{2 +}

on electrolysing

{CuSO}_{4 (aq)}

solution using the

Cu

electrode:

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 24

For the reduction of ${NO}_{3}$ - ion in an aqueous solution, $E °$ is $+ 0.96 V$ . Values of $E °$ for some metal ions are given below :

$\begin{array}{l} V^{2 +} (aq) + 2 e^{-} ⟶ V & E^{0} = - 1.19 V \\ {Fe}^{3 +} (aq) + 3 e^{-} ⟶ Fe & E^{0} = - 0.04 V \\ {Au}^{3 +} (aq) + 3 e^{-} ⟶ Au & E^{0} = + 1.40 V \\ {Hg}^{2 +} (aq) + 2 e^{-} ⟶ Hg & E^{0} = + 0.86 V \end{array}$

The metals which can not oxidized by ${NO}_{3}^{-}$ in aqueous solution is :

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 25

In the electrolysis of an aqueous nickel

(ll)

sulphate solution, the process

2 H_{2} O ⇌ O_{2} + 4 H^{+} + 4 e^{-}

occurs at the anode. The material of construction of the anode is

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 26

The amount of electricity that can deposit

108 gm

of silver from the

{AgNO}_{3}

solution is

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 27

What weight of copper will be deposited by passing

2

Faradays of electricity through a cupric salt? (Atomic weight of

Cu = 63.5

)

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 28

Three moles of electrons are passed through three solutions in succession containing

{AgNO}_{3}, {CuSO}_{4}

and

{AuCl}_{3}

, respectively. The molar ratio of amounts of cations reduced at the cathode will be

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 29

A current is passed through

2

voltameters connected in series. The first voltameter contains

{XSO}_{4}

(aq.) and the second has

Y_{2} {SO}_{4}

(aq.). The relative atomic masses of

X

and

Y

are in the ratio of

2 : 1

. The ratio of the mass of

X

liberated to the mass of

Y

liberated is:

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Alpha Question Bank for Medical: Chemistry>Chapter 9 - Electrochemistry>Exercise 1>Q 30

In a half-cell containing

[{Tl}^{3 +}] = 0.1 M

and

[{Tl}^{+}] = 0.01 M,

the cell potential is

- 1.2496 V

for the reaction

{Tl}^{+} ⟶ {Tl}^{3 +} + 2 e^{-}

The standard reduction potential of the

{Tl}^{3 +} | {Tl}^{+}

couple at

25 ° C

is