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pH of a mixture containing 0.2 M X^– (base) and 0.4 M HX with pKb (X^–) = 4 is :

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pH of a mixture containing 0.2 M X– (base) and 0.4 M HX with pKb (X–) = 4 is : 

(A) 4 + log 2 

(B) 4 – log 2 

(C) 10 + log 2 

(D) 10 – log 2

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Correct option: (D) 10 – log 2

Explanation: 

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