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Which one of the following compounds doe...

Which one of the following compounds does not decolourise an acidified aqueous solution of `KMnO_(4)`

A

`10^(-5)`

B

6.9

C

None

D

`10^(9)`

Text Solution

Verified by Experts

The correct Answer is:
4
The concerned reaction will be
`HA+OH^(-) hArr A^(-)+H_(2)O " "….(1)`
`HA hArrH^(+)+A^(-)" "K_(a)=10^(-5)" "....(2)`
`H^(+)+OH^(-)hArr H_(2)O" "Keq=(1)/(Kw)=(1)/(10^(-14))" "....(3)`
`(1)` can be obtained by adding `(2) & (3)`
`K_(eq)=Kaxx(1)/(K_(w))=10^(-5)xx(1)/(10^(-4))=10^(9)`
Hence `(4)` ans.
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