$A$ gaseous hypothetical chemical equation $2A \rightleftharpoons 4B + C$ is carried out in a closed vessel. The concentration of $B$ is found to increase by $5 \times 10^{-3} \ mol \ L^{-1}$ in $10 \ s$. The rate of appearance of $B$ is
- A$5 \times 10^{-4} \ mol \ L^{-1} \ s^{-1}$
- B$5 \times 10^{-5} \ mol \ L^{-1} \ s^{-1}$
- C$6 \times 10^{-5} \ mol \ L^{-1} \ s^{-1}$
- D$4 \times 10^{-4} \ mol \ L^{-1} \ s^{-1}$
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