MCQ
Which can act as buffer?
- ANH4C1 + HC1
- BCH3COOH + H2CO3
- C40ml of 0.1 M NaCN + 20ml of 0.1 MHCN
- DNaC1 + NaOH
✓
Answer
- 40ml of 0.1 M NaCN + 20ml of 0.1 MHCN
Explanation:
Buffer solution is a mixture of weak acid and its salt of weak acid.
NaCN → salt of strong base and weak acid
HCN → weak acid
$\therefore$ They can act as buffer.
While no other options follow definition of buffer solution.
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