question_answer

The ionisation constant of ammonium hydroxide is \[1.77\times {{10}^{-5}}\] at 298 K. Hydrolysis constant of ammonium chloride is                                                                                                                        [AIPMT (S) 2009]

A)  \[5.65\times {{10}^{-10}}\]     

B)       \[6.50\times {{10}^{-12}}\]

C)  \[5.65\times {{10}^{-13}}\]     

D)       \[5.65\times {{10}^{-12}}\]

Correct Answer: A

Solution :

Given,

(i)

Hydrolysis of  takes place as,

or

Hydrolysis constant, (ii)

or

From Eqs (i) and (iii)