1.

For reaction a A tox P , when [A] = 2.2 mM , the rate was found to be 2.4 m M s^(-1) . On reducing concentration of A to half , the rate changes to 0.6 m M s^(-1) . The order of reaction with respect to A is

Answer»

1.5
`2.0`
`2.5`
`3.0`

Solution :`a A to x`P
Rate of constant = `[A]^(a)`
Order of reaction = a
`[A]_(1) = 2.2` mM , `r_(1) = 2.4 m M s^(-1) "" … (i)`
`[A]_(2) = 2.2//2 m M , r_(1) = 0.6 m M s^(-1)` or `(2.4)/(4) "" … (ii)`
On REDUCING the CONCENTRATION of A to HALF , the rate of reaction is decreased by four times .
Rate of reaction = `[A]^(2)`
Order of reaction = 2 .


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