The rate of a gaseous reaction is halved when the volume of the vessel is doubled. What is the order of reaction ?

Explanation

Suppose, order of reaction is n and the reaction is A (g) `to` Products
Rate=`k[A]^n`…(i)
When volume is doubled, molar conc. becomes half and rate of reaction gets halved.
`"Rate"/2=k(A/2)^n`…(ii)
Dividing equation (i) by equation (ii),
`(2)^1 =(2)^n`
n=1