Science Class 7 Acids, Bases and Salts

Asked by RAJANYA MONDAL · The Level field School

Which of the following has a pH less than 7?

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Answer: C. Aqueous NH₄Cl solution

NH4Cl is a salt of a strong acid (HCl) and a weak base (NH4OH), so its solution in water is acidic, with pH below 7. Pure water and NaCl solution are neutral (pH 7), and Na2CO3 solution is basic.

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