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प्रश्न
Give one example of a salt which gives an aqueous solution having:
pH less than 7
उत्तर
NH4Cl is formed from a weak base, ammonium hydroxide (NH4OH), and a strong acid, hydrochloric acid (HCl). On hydrolysis, NH4Cl forms more H+ ions than OH- ions. Thus, it is acidic, with a pH less than 7.
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