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Q.

The Ka value of HCN is 10-9. what is the pH of decimolar HCN solution.

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a

9

b

3

c

4

d

5

answer is B.

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Detailed Solution

Ka=10−9, c=0.1=10−1M
[H+]=Ka⋅c=10−9⋅10−1=10−5M
∴PH=−log10−5=5

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