Which of the following expression can be used to describe the instantaneous rate of the reaction ?
`2A+B rarr A_(2)B`

Options

A. `(1)/(2)(-d[A])/(d t)`
B. `(-d[A])/(d t)`
C. `(1)/(2) (d[A_(2)B])/(d t)`
D. `(1)/(2) (-d[A])/(d t).(d[B])/(d t)`

Answer

A

Explanation

The instantaneous rate of the reaction can be expressed by any of the following expresisons.
`(1)/(2)(-d[A])/(d t)` or `(-d[B])/(d t)` or `(d[A_(2)B])/(d t)`