MCQ
Which can act as buffer?
- A$ \mathrm{NH}_4 \mathrm{C} 1+\mathrm{HC} 1 $
- B$ \mathrm{CH}_3 \mathrm{COOH}+\mathrm{H}_2 \mathrm{CO}_3$
- ✓$40\ ml$ of $\ce{0.1 M NaCN + 20ml}$ of $\ce{0.1 MHCN}$
- D$\ce{NaC1 + NaOH}$
✓
Answer
Correct option: C.
$40\ ml$ of $\ce{0.1 M NaCN + 20ml}$ of $\ce{0.1 MHCN}$
Buffer solution is a mixture of weak acid and its salt of weak acid.
$\ce{NaCN} \rightarrow$ salt of strong base and weak acid
$\ce{HCN} \rightarrow$ weak acid
$\therefore$ They can act as buffer.
While no other options follow definition of buffer solution.
$\ce{NaCN} \rightarrow$ salt of strong base and weak acid
$\ce{HCN} \rightarrow$ weak acid
$\therefore$ They can act as buffer.
While no other options follow definition of buffer solution.
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