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Question

Which one of the following salts on dissolution in water will give a solution of pH less than 7 at 298 K?
  1. CH3COONa
  2. NaBr
  3. NH4Cl
  4. KCN


Solution

The correct option is C NH4Cl
The table given below shows the information regarding the constituents of salts given as the options SaltAcid usedBase usedType of combinationpH of saltKCNHCNKOHWeak acid+Strong base>7CH3COONaCH3COOHNaOHWeak acid+Strong base>7NaBrHBrNaOHStrong acid+Strong base=7NH4ClHClNH4OHStrong acid+Weak base<7From the table given above, it can be concluded that ammonium chloride (NH4Cl) is the salt which will give a pH less than 7 in its aqueous solution.

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