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K(a) for HCN is 5 xx 10^^(-10) at 25^(@)...

`K_(a)` for `HCN` is `5 xx 10^^(-10)` at `25^(@)C`. For maintaining a constant `pH` of `9.0`, the volume of `5M KCN` solution required to be added to `10mL` of `2M HCN` solution is

A

4 mL

B

8 mL

C

2 mL

D

10 mL

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The correct Answer is:
c
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