Among the following, the correct statement is

pH decreases when solid ammonium chloride is added to a dilute aqueous solution of

N H_{3}

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pH decreases when solid sodium acetate is added to dilute aqueous solution of acetic acid

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pH decreases when solid NaCl added to a dilute aqueous solution of NaOH

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pH decreases when solid sodium oxalate is added to a dilute aqueous solution of oxalic acid

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Solution

The correct option is A pH decreases when solid ammonium chloride is added to a dilute aqueous solution of $N H_{3}$
$d i l . a q . s o l u t i o n o f N H_{3} = N H_{4} O H N H_{4} O H \to N H_{4}^{+} + O H^{-} N H_{4} C l \to N H_{4}^{+} + C l^{-}$
due to common ion effect, equilibrium of $N H_{4} O H$ shifts in backward direction
so $[O H^{-}]$ decreases, pH, decreases

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N a O H

(C H_{3} C O O N a)

(C H_{3} C O O H)

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