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Among the following, the correct statement is
(a) pH decreases when solid ammonium chloride is added to a dilute aqueous solution of NH3
(b) pH decreases when solid sodium acetate is added to a dilute aqueous solution of acetic acid
(c) pH decreases when solid NaCl is added to a dilute aqueous solution of NaOH
(d) pH decreases when solid sodium oxalate is added to a dilute aqueous solution of oxalic acid
Among the following, the correct statement is
(a) pH decreases when solid ammonium chloride is added to a dilute aqueous solution of NH3
(b) pH decreases when solid sodium acetate is added to a dilute aqueous solution of acetic acid
(c) pH decreases when solid NaCl is added to a dilute aqueous solution of NaOH
(d) pH decreases when solid sodium oxalate is added to a dilute aqueous solution of oxalic acid
Answer is : (a) pH decreases when solid ammonium chloride is added to a dilute aqueous solution of NH3
Dil.aqueous solution of NH3 is NH4OH.
NH4OH ⇌ NH4+ + OH–
On adding solid ammonium chloride
NH4Cl → NH4+ + Cl–
The reaction moves backward due to common ion effect. The concentration of OH− decreases and hence the pH decreases.