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pH of a mixture of 1 M benzoic acid (pKa = 4.2) and 1 M sodium benzoate is 4.5, in 150 mL buffer, benzoic acid is : 

(A) 200 mL 

(B) 150 mL 

(C) 100 mL 

(D) 50 mL

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Best answer

Correct option: (D) 50 mL

Explanation: 

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