Which of the following salts will give an aqueous solution having pH of almost 7?
(a) NH₄NO₃
(b) NH₄Cl
(c) CaCl₂
(d) KCl

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Solution

(d) KCl

KCl is formed from a strong acid, hydrochloric acid (HCl), and a strong base, potassium hydroxide (KOH). Thus, KCl, on hydrolysis, forms equal amounts of H⁺ and OH^- ions. This is why an aqueous solution of KCl shows a pH of almost 7.

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Give one example each of a salt which gives an aqueous solution having :

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