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Q.

The hydrolysis constant for ZnCl2 will be

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a

Kh = KwKh

b

Kh = Kw2Kb

c

Kh = Kw2Kb2

d

Kh = KbKw2where Kb is effective dissociation constant of base Zn++

answer is B.

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Detailed Solution

Zn++   +   2H2O   ⇌   ZnOH2  +  2H+∴   Kh = ZnOH2  H+2Zn++              …. (1)ZnOH2  ⇌  Zn++  + 2OH- ∴   Kb = Zn++  OH-2ZnOH2,     Kw = H+ OH-∴      Kw2Kb = Kh
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