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Q.

pH of an aqueous solution of NH4Cl is

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a

<7

b

>7

c

1

d

7

answer is B.

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Detailed Solution

Step 1: Analyzing the given conditions

NH4Cl (Ammonium chloride) is an acidic salt of strong acid (Hydrochloric acid) and weak base (Ammonium hydroxide).

Concentration of NH4Cl=0.1M

pKb=4.74

Step 2: Calculating the pH of the NH4Cl solution

The formula for the calculation of pH of salt of strong acid and weak base can be represented as:

pH &=-12logKw-12logC+12logKb 

pH &=-12log10(-14)-12log(0.1)+12log(4.7) 

pH &=7+0.5-0.3360

pH &=7.163

Therefore, pH of an aqueous solution of 0.1MNH4Cl solution is $7.163$

Hence the correct answer (B) >7

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