In the hydrolysis of salt of weak acid & base :

degree of hydrolysis or cation and anion is different

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Degree of hydrolysis of cation and anion is same

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degree of hydrolysis of cation and anion is different and they can never be assumed same.

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degree of hydrolysis of cation and anion is different but they are very close to each other when they are getting hydrolysed in the presence of each other

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Solution

The correct option is D degree of hydrolysis of cation and anion is different but they are very close to each other when they are getting hydrolysed in the presence of each other
Due to the common ion effect, the hydrolysis of both the ions occurs to a greater extent in the presence of each other.
The hydrolysis of the ion having a smaller value of $K_{n}$ is affected to a greater extent than the hydrolysis of the other ion.
Hence, cation and anion have a different degree of hydrolysis, but when they are getting hydrolyzed in the presence of each other, their degrees of hydrolysis are close to each other.

Hence, the correct option is (D).

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