Which of the following salts on being dissolved in water gives pH7 at 25^ C ?

Question

Which of the following salts on being dissolved in water gives pH>7 at 25^ C ?

Accepted Answer

Correct answer: A. (a) : KCN hydrolyses to give KOH and HCN in water. KOH being a strong base easily neutralizes the weak acid HCN and the resulting solution becomes basic or pH>7. KNO_3 ( aq ) ⇌ KOH ( SB )+ HNO_3 ( SA ) ; thus neutral NH_4 Cl_ ( aq ) ⇌ NH_4 OH ( WB )+ HCl ( SA ); thus acidic ( pH<7 ) NH_4 CN_ ( aq ) ⇌ NH_4 OH ( WB )+ HCN ( WA ) thus neutral SA= strong acid, SB= strong base WA= weak acid, WB= weak base

$Which of the following salts on being dissolved in water gives pH > 7 at 25^{\circ} C ?$

Solution

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