Which mixture forms a buffer when dissolved in 1 ,lit. of water - Vidyadip

MCQ

Which mixture forms a buffer when dissolved in $1\,lit.$ of water

A
$0.2\,mol\,\,NaOH$ and $0.2\,mol$ $\,HBr$
B
$0.2\,mol\,\,NaCl$ and $0.3\,mol$ $\,HCl$
✓
$0.4\,mol\,\,HNO_2$ and $0.2\,mol\,\,NaOH$
D
$0.5\,mol\,\,NH_3$ and $0.5\,mol\,\,HCl$

✓

Answer

Correct option: C.

$0.4\,mol\,\,HNO_2$ and $0.2\,mol\,\,NaOH$

c
$0.4 \,mol\,HNO_2 +0.2\, mol\,NaOH$ will form a buffer as it is a mixture of weak acid and its conjugate base.

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