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Question

Which of the following mixtures can act as a buffer if equal amount of both species is mixed?

A
HCN+NaCN
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B
HCOOH+NaOH
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C
NH4OH+(NH4)2SO4
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D
(a) and (c) above.
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Solution

The correct option is D (a) and (c) above.
Acidic buffer solution: Acidic buffer are solution of a mixture of weak acid and salt of its conjugate base of that acid with a strong base.
a) HCN+NaCN
Basic bufer solution: Basic buffer are solution of a mixture of weak base and salt of its conjugate acid of that base with a strong acid.
c) NH4OH+(NH4)2SO4
b) HCOOH+NaOH is not a buffer solution.
Since formic acid is not present in excess amount.
Hence, d is correct option.

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