In a catalytic conversion of $N_2$ to $NH_3$ by Haber's process,the rate of reaction was expressed as change in the concentration of ammonia per time is $40 \times 10^{-3} \ mol \ L^{-1} s^{-1}$. If there are no side reactions,the rate of the reaction as expressed in terms of hydrogen is (in $mol \ L^{-1} s^{-1}$)

  • A
    $60 \times 10^{-3}$
  • B
    $20 \times 10^{-3}$
  • C
    $1.2$
  • D
    $10.3 \times 10^{-3}$

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