Which pair of compounds will form a buffer in aqueous solution? NaCN and KCN HCl and NaOH NaCN

pair-compounds

#1

Which pair of compounds will form a buffer in aqueous solution?
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Answer:
A buffer solution is an aqueous solution of a weak acid and its conjugate base or weak base and its conjugate acid.

(a)
Since, both NaCN and KCN are salts and are neutral.
Therefore, NaCN and KCN cannot form a buffer solution.
Hence, this option is incorrect.

(b)
Since, HCI is a strong acid and NaOH is a strong base.
Therefore, HCI and NaOH cannot form a buffer solution.
Hence, this option is incorrect.

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