Which among the following salts forms basic solution when dissolved in water?

• A

  $\mathrm{NaNO}_3$
• B

  $\mathrm{CH}_3 \mathrm{COONH}_4$
• Correct answer
  C

  KCN
• D

  $\mathrm{NH}_4 \mathrm{~F}$

Hence, the correct answer is option: 'C'.