For a reaction `1//2A to 2B`, rate of disappearance of A is related to the rate of appearance of B by the expression:

Options

A. `-(d[A])/(dt)=(1)/(2)(d[B])/(dt)`
B. `-(d[A])/(dt)=(1)/(4)(d[B])/(dt)`
C. `-(d[A])/(dt)=(d[B])/(dt)`
D. `(d[A])/(dt)=4(d[B])/(dt)`

Answer

B

Explanation

`(1)/(2)Ararr2B`
For the given reaction,
`-(2d[A])/(dt)=(1)/(2)(d[B])/(dt)="rate of reaction"`
Rate of disappearance of A
`-(d[A])/(dt)=(1)/(2xx2)(d[B])/(dt)=(1)/(4)(d[B])/(dt)`