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CBSE

Subject

Chemistry

NEET Chemistry : Electrochemistry

Multiple Choice Questions

51.

How long it will take to deposit 1.0 g of chromium when a current of 1.25 A flows through a solution of chromium (III) sulphate ? (Molar mass of Cr = 52)

1.24 min
1.24 h
1.24 s
None of these

52.

What amount of Cl₂ gas liberated at anode, if 1 ampere current is passed for 30 minute from NaCl solution ?

0.66 mol
0.33 mol
0.66 g
0.33 g

53.

A 35% solution LiCl was electrolysed by using a 2.5A current for 0.8h.Assuming thecurrent efficiency of 90%. The mass of LiOHproduced at the end of electrolysis.
[Atomic mass of Li=7] is:

1.61 g
2.71 g
4.02 g
3.70 g

54.

What is the electrode potential (in V) of the following electrode at 25°C ?

Ni²⁺ (0.1 M) | Ni(s)

(Standard reaction potential of Ni²⁺ | Ni is -0.25V, $\frac{2.303 RT}{F} = 0.06$ )

-0.28V
-0.34V
-0.82V
-0.22V

55.

$For the given, Sn \to {Sn}^{2 +} (0.1 M) + 2 e (Given E_{Sn / {Sn}^{2 +}}^{0} = 0.136 V) The electrode potential of the cell at 25 ° C is :$

0.165 V
0750 V
0.421 V
0.012 V

56.

EMF or hydrogen electrode in terms of pH at 1 atm pressure is

E_{H2 = $\frac{RT}{F} pH$}
E_{H2 = $\frac{RT}{F} \frac{1}{pH}$}
E_{H2 = $\frac{2.303 RT}{F} pH$}
E_{H2 = -0.0591 pH}

57.

How much chlorine will be liberated on passing one ampere current for 30 min. through NaCl solution ?

0.66 mole
0.33 mole
0.66 g
0.33 g

58.

Assuming that constant current is delivered. How many kW-h of electricity can be produced by the reaction of 1.0 mole Zn with Cu ion in a Daniel cell in which all the concentration remains 1.00 M.

(Given E $Given E °_{Zn / {Zn}^{+} = 0.76}$ =0.76V),

0.069 kW-h
0.074 kW-h
0.080 kW-h
0.059 kW-h

59.

Which of the following formula is applicable for weak electrolyte:

$α = \frac{λ_{m}}{λ_{m}^{\circ}}$
$K_{a} = \frac{{Cα}^{2}}{(1 - α)}$
$K_{a} = \frac{{Cλ}_{m}^{2}}{λ_{m}^{\circ} (λ_{m}^{\circ} - λ_{m})}$
All of these

60.

The compounds formed at anode in the electrolysis of an aqueous solution of potassium acetate, are

C₂H₆ and CO₂
C₂H₄ and CO₂
CH₄ and H₂
CH₄ and CO₂

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