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A gaseous hypothetical chemical equation...

A gaseous hypothetical chemical equation `2A hArr 4B+C` is carries out in a closed vessel. The concentration of `B` is found to increase by `5 xx 10^(-3) mol L^(-1)` in `10` second. The rate of appearance of `B` is

A

`5xx10^(-4) mol L^(-1) S^(-1)`

B

`5xx10^(-5) mol L^(-1) S^(-1)`

C

`6xx10^(-5) mol L^(-1) S^(-1)`

D

`4xx10^(-4) mol L^(-1) S^(-1)`

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The correct Answer is:
A
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