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Conisder a reaction aG+bH rarr Products....

Conisder a reaction `aG+bH rarr` Products. When concentration of both the reactants `G` and `H` is doubled, the rate increases eight times. However, when the concentration of `G` is doubled, keeping the concentration of `H` fixed, the rate is doubled. The overall order of reaction is

A

`0`

B

`1`

C

`2`

D

`3`

Text Solution

Verified by Experts

The correct Answer is:
D
Rate `(r )=K[A]^(alpha)[B]^(beta)=K[x]^(alpha)[y]^(beta)`
`r=K(2x)^(alpha)(2y)^(beta)=2^((alpha+beta)).Kx^(alpha)y^(beta)`…….`(i)`
`2r=K(2x)^(alpha)y^(beta)=2^(alpha)Kx^(alpha)y^(beta)`…………`(ii)`
`(iii)//(i) ` gives `2=2^(alpha) :.alpha=1`
`(ii)//(iii)` gives `4=2^(beta) :.beta=2`
Overall order `=1+2=3`
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