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A gaseous reaction 2A(g) to B(g)+5C(g) s...

A gaseous reaction `2A(g) to B(g)+5C(g)` shows increase in pressure from 80 mm of Hg to 100 mm of Hg in 5 minutes. The rate of disappearance of A is:

A

`4"mm Hg min"^(-1)`

B

`8"mm Hg min"^(-1)`

C

`1"mm Hg min"^(-1)`

D

`2"mm Hg min"^(-1)`

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