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Q.

Aqueous solution of which of the following shows lower pH?

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a

ZnCl

b

NH4CN

c

K2SO4

d

KCN 

answer is B.

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Detailed Solution

K2SO4  is the salt of strong acid H2SO4 and KOH

ZnCl2 l is the salt of weak base ZnOH2  and strong acid HCl

KCN is the salt of weak acid HCN and strong base KOH.

NH4CN is the salt of weak acid HCN and NH4OH.

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