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Which of the following salts gives an aqueous solution with pH less than 7?
ASodium carbonate
BSodium chloride
CSodium bicarbonate
DAmmonium chloride
Answer & Solution
Correct answer: D. Ammonium chloride
1. A salt of a strong acid and a weak base gives an acidic solution.
2. Ammonium chloride comes from HCl (strong acid) and ammonia (weak base).
3. Its aqueous solution is therefore acidic, with pH less than 7.
_Source: RRB Group D CEN-02/2018 PYQ, Q.52._
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