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Question : 25
Total: 27
SECTION - D
Calculate
(i) Less than
(ii) Greater than
OR
(a) A steady current of 2 amperes was passed through two electrolytic cells
(b) In the plot of molar conductivity
Answer the following :
(i) Predict the nature of electrolytes A and B:
(ii) What happens on extrapolation of
Solution:
(i) When external opposite applied voltage is less than 2.71, it is less than
(ii) When external opposite applied potential is greater than 2.71, it is greater than
OR
(a) Charge required to deposite
The quantity of charge is related to current as
Therefore, the time needed to deposit
So, the current flowed through the cells for 4825 seconds.
The amount of
Therefore, the mass of
(b) (i) Molar conductivity of strong electrolytes increases linearly as the square root of the concentration decreases; therefore, electrolyte A is a strong electrolyte. Molar conductivity of weak electrolytes increases non-linearly as square root of concentration decreases; therefore, electrolyte B is a weak electrolyte.
(ii) As concentration of strong electrolyte approaches zero, the molar conductivity of the plot intercepts the molar conductivity axis, giving the limiting value of molar conductivity
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