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Q.

If Ka = 10-5 for a weak acid, then pKb for its conjugate base would be

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a

9

b

10-9

c

10-10

d

5

answer is B.

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Detailed Solution

Ka × Kb = Kw

Kb =KwKa  =  10-1410-5 = 10-9

pKb= -log Kb=9

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