Electrochemistry Quiz 3

Question 1

The molar conductivity of cation and anion of salt BA are 180 and  $220\, mhos\, cm^2\,mol^{-1}$ respectively. The molar conductivity of salt BA at infinite dilution is

Accepted Answer

$400 \, mhos . cm ^2 . Mol ^{-1}$

Answer

$90 \, mhos.cm ^2 . Mol ^{-1}$

Answer

$110\,mhos . cm ^2 . Mol ^{-1}$

Answer

$200 \, mhos . cm ^2 . Mol ^{-1}$

Question 2

If $\wedge_m$ and $\wedge_0$ are the molar conductivities of a weak electrolyte at concentration C and at zero concentration, then the dissociation constant Ka is given by

Accepted Answer

$K_a = \frac{\wedge^2{_m} \times C}{\wedge_0(\wedge_0 - \wedge_m)}$

Answer

$K_a = \frac{\wedge^2{_m} \times C}{\wedge_0 - \wedge_m}$

Answer

$K_a = \frac{\wedge^2{_0} \times C}{\wedge_0(\wedge_0 - \wedge_m)}$

Answer

$K_a = \frac{\wedge{_m} \times C}{\wedge_0(\wedge_0 - \wedge_m)}$

Question 3

What is the ratio of volumes of $H_2$ and $O_2$ liberated during electrolysis of acidified water ?

Accepted Answer

2 : 1

Answer

1 : 2

Answer

1 : 8

Answer

8 : 1

Question 4

What weight of copper will be deposited by passing 2 Faradays of electricity through a cupric salt? (atomic mass = 63.5)

Accepted Answer

63.5 g

Answer

31.75 g

Answer

127 g

Answer

12.7 g

Question 5

The S.I. unit of cell constant for conductivity cell is

Accepted Answer

$m^{-1}$

Answer

$S. m ^{-2}$

Answer

$cm^{-2}$

Answer

$S .dm ^2 . mol ^{-1}$

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