A litre of buffer solution contains 0.1 mole of each of $NH_3$ and $NH_4 Cl$. On the addition of 0.02 mole of $HCl$ by dissolving gaseous $HCl$, the $pH$ of the solution is found to be $\times 10^{-3}$ (Nearest integer)
[Given : $pK_b(NH_3)=4.745$
$\log 2=0.301$
$\log 3=0.477$
$T=298 K]$
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