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CBSE

NEET Chemistry : Electrochemistry

Multiple Choice Questions

71.

What is the effect of dilution on the equivalent conductance of strong electrolyte?

Decrease on dilution
Remains unchanged
Increase on dilution
None of the above

72.

Corrosion of iron is essentially an electrochemical phenomenon where the cell reactions are :

Fe is oxidised to Fe²⁺ and dissolved oxygen in water is reduced to OH^-
Fe is oxidised to Fe³⁺ and H₂O is reduced to $O_{2}^{2 -}$
Fe is oxidised to Fe²⁺ and H₂O is reduced to $O_{2}^{2 -}$
Fe is oxidised to Fe²⁺ and H₂O is reduced to O₂

73.

Assertion : If standard reduction potential for the reaction Ag⁺ + e^- $\to$ Ag is 0.80 volt, then for the reaction 2Ag⁺ + 2e^- $\to$ 2Ag, it will be 1.60 volt.

Reason: If concentration of Ag⁺ ions is doubled, the standard electrode potential is also doubled.

If both assertion and reason are true and reason is the correct explanation of assertion.
If both assertion and reason are true but reason is not the correct explanation of assertion
If assertion is true but reason is false.
If both assertion and reason are false.

74.

An aqueous solution containing 6.5 g of NaCl of 90 purity was subjected to electrolysis. After the complete electrolysis, the solution was evaporated to get solid NaOH. The volume of 1 M acetic acid required to neutralise NaOH obtained above is :

1000 cm³
2000 cm³
100 cm³
200 cm³

75.

How many moles of Pt may be deposited on the cathode when 0.80 F of electricity is passed through a 1.0 M solution of Pt⁴⁺ ?

1.0 mol
0.20 mol
0.40 mol
0.80 mol

76.

Calculate $\land_{HOAc}^{\infty}$ (in S cm² mol^-1) using appropriate molar conductances of the electrolytes listed in the given table

Electrolyte

KCl

KNO₃

HCl

NaOAc

NaCl

$\land^{\infty}$

(S cm² mol^-1)

149.9

145.0

426.2

91.0

126.5

at infinite dilution in H₂Oat 25 $°$ C

517.2
305.0
390.7
217.5

77.

Ionic conductances of H⁺ and S $O_{4}^{2 -}$ at infinite dilution are x and y S cm² equiv^-1 . Hence , equivalent conductance of H₂SO₄ at infinite dilution is :

(x + y)
2(x + y)
2x + y
x + 2y

78.

A conductivity cell has a cell constant of 0.5 cm^-1. This cell when filled with 0.01 M NaCl solution has a resistance of 384 ohms at 25°C. Calculate the equivalent conductance of the given solution.