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1. Some basic concept of chemistry — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry1. Some basic concept of chemistry1 Mark
MCQ
$56 \,g$ of nitrogen and $8 \,g$ hydrogen gas are heated in a closed vessel. At equilibrium $34\, g$ of ammonia are present. The equilibrium number of moles of nitrogen, hydrogen and ammonia are respectively
  • A
    $1,2,2$
  • B
    $2,2,1$
  • ✓
    $1,1,2$
  • D
    $2,1,2$
✓

Answer

Correct option: C.
$1,1,2$
c
(c)                   ${N_2} + 3{H_2}$ $ \rightleftharpoons $ $2N{H_3}$….. $(i)$

at $t = 0$      $56\,gm$    $8\,gm$      $0\,gm$

                   $=$ $2\,mole$    $4\,mole$   $0\,mole$

at equilibrium  $2 - 1$       $4 - 3$         $34\,gm$

                  $=$ $1\,mole$   $=$ $1\,mole$  $=$ $2\,mole$

According to eq. $(i)$ $2$ $mole$ of ammonia are present $\&$ to produce $2$ $mole$ of $N{H_3}$, we need $1$ mole of ${N_2}$ and $3$ $mole$ of ${H_2}$ hence $2 - 1 = 1$ $mole$ of ${N_2}$ and $4 - 3 = 1$ mole of ${H_2}$ are present at equilibrium in vessel.

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