MCQ
$5 \,ml$ of $N$ $HCl$, $20 \,ml$ of $N/2\,\,{H_2}S{O_4}$ and $30\, ml$ of $N/3\,\,HN{O_3}$ are mixed together and volume made to one litre. The normality of the resulting solution is
  • A
    $N/5$
  • B
    $N/10$
  • C
    $N/20$
  • $N/40$

Answer

Correct option: D.
$N/40$
d
(d) $NV = {N_1}{V_1} + {N_2}{V_2} + {N_3}{V_3}$

$N \times 1000 = 1 \times 5 + \frac{1}{2} \times 20 + \frac{1}{3} \times 30$

$= 5 + 10 + 10 = 25$

$N = 0.025 = \frac{N}{{40}}$.

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