Which mixture forms a buffer when dissolved in \( 1 \mathrm{~L} \) of water?....

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Which mixture forms a buffer when dissolved in \( 1 \mathrm{~L} \) of water?
\( \mathrm{P} \)
(1) \( 0.2 \mathrm{~mol} \mathrm{NaOH}+0.2 \mathrm{~mol} \mathrm{HBr} \)
(2) \( 0.2 \mathrm{~mol} \mathrm{NaCl}+0.3 \mathrm{~mol} \mathrm{HCl} \)
(3) \( 0.4 \mathrm{~mol} \mathrm{HNO}_{2}+0.2 \mathrm{~mol} \mathrm{NaOH} \)
(4) \( 0.5 \mathrm{~mol} \mathrm{NH}_{3}+0.5 \mathrm{~mol} \mathrm{HCl} \)


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