Q.

A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be


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a

KCl

b

CH3COONa

c

Na2CO3

d

NH4Cl 

answer is D.

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Detailed Solution

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If the pH of solution is less than 7, the salt is most likely to be NH4Cl.
The aqueous solution of a salt should pH 7. Salt is formed by the reaction between an acid and a base. Ammonium chloride is an acidic salt. It is formed by hydrochloric acid which is a strong acid and ammonium hydroxide which is a weak base. So, ammonium chloride slightly behaves as acidic in nature. Potassium chloride and sodium acetate are salts with pH of 7. Sodium carbonate is a basic salt having pH more than 7.
 
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