Fixed volume of \( 0.1 M \) benzoic acid \( \left(\mathrm{p} K_{a}=4.2\right. \) ) solution is a...

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Fixed volume of \( 0.1 M \) benzoic acid \( \left(\mathrm{p} K_{a}=4.2\right. \) ) solution is added into \( 0.2 M \) sodium benzoate solution and formed a \( 300 \mathrm{~mL} \), resultant acidic buffer solution. If \( \mathrm{pH} \) of this buffer solution is \( 4.5 \) then find added volume of benzoic acid :
(a) \( 100 \mathrm{~mL} \)
(b) \( 150 \mathrm{~mL} \)
(c) \( 200 \mathrm{~mL} \)
(d) None of these
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