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In a gaseous phase reaction A(2)(g)toB(t...

In a gaseous phase reaction `A_(2)(g)toB(t)+1(1//2)C(g)`, the increase in pressure from 100 mm to 120 mm is noticed in 5 minute.The rate of disappearance of `A_(2)` in mm `"min"^(-1)` is

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The correct Answer is:
8
`A_(2)to B+1/2C`
`100" "0" "2`
`(100-x)" "x" "x/2`
`60" "40" "20`
`implies100-x+x+x/2=120,r_(A_(2))=(d(P_(A_(2))))/(dt)=(100-60)/5=40/5=8`
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