An acidic buffer is obtained on mixing :

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Question:
An acidic buffer is obtained on mixing :

$100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COOH}$ and $100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$
$100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{HCl}$ and $200 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NaCl}$
$100 \mathrm{~mL}$ of $0.1 \mathrm{MCH}_{3} \mathrm{COOH}$ and $200 \mathrm{~mL}$ of $0.1 \mathrm{MNaOH}$
$100 \mathrm{~mL}$ of $0.1 \mathrm{MHCl}$ and $200 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{CH}_{3} \mathrm{COONa}$

Correct Option: , 4

Solution:

Buffer solution contains $\mathrm{CH}_{3} \mathrm{COONa}$ (10 millimole) and $\mathrm{CH}_{3} \mathrm{COOH}$ (10 millimole) which is a acidic buffer.