Among the following, the correct statement is

Question

Among the following, the correct statement is, p H decreases when solid ammonium chloride is added to a dilute aqueous solution of N H 3, p H decreases when solid sodium acetate is added to a dilute aqueous solution of acetic acid, p H decreases when solid N a C l is added to a dilute aqueous solution of N a O H, p H decreases when solid sodium oxalate is added to a dilute aqueous solution of oxalic acid

MARKS App · Accepted Answer

Dil.aqueous solution of N H 3 is N H 4 O H N H 4 O H ⇌ N H 4 + + O H - On adding solid ammonium chloride N H 4 C l ⟶ N H 4 + + C l - The reaction moves backward due to common ion effect. The concentration of O H - decreases and hence the p H decreases.

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