Question $6$

$1$ pts

$100\mathrm{.}0mL$ of each of the following solutions is mixed; which one of the mixed solutions is a buffer?

$1\mathrm{.}0MN{H}_{4}Cl(aq)+0\mathrm{.}4MHCl(aq)$

$1\mathrm{.}0MN{H}_3(aq)+0\mathrm{.}4MHCl(aq)$

$1\mathrm{.}0MN{H}_3(aq)+0\mathrm{.}6$MKOH$(aq)$

$1\mathrm{.}0MH{H}_3(aq)+1\mathrm{.}0MHCl(aq)$

$1\mathrm{.}0$ M NH $44Cl(aq)+1\mathrm{.}0$MKOH$(aq)$