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Chemistry-

General

Easy

Question

Consider a reaction; $a G plus b H rightwards arrow P r o d u c t s$ When concentration of both the reactants G and H is doubled, the rate increases by eight times. However, when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall of the reaction,

(a) 0
1
2
3

The correct answer is: 3

$a G plus b H rightwards arrow P r o d u c t s$
Suppose order of reaction =n
When concentration of both G and H doubled then rate increases by eight times.
$r a t e equals k open parentheses r e a c t a n t s close parentheses to the power of n end exponent$
$left parenthesis 8 right parenthesis equals k open parentheses 2 close parentheses to the power of n end exponent$
$open parentheses 2 close parentheses to the power of 3 end exponent equals k open parentheses 2 close parentheses to the power of n end exponent$
n=3
When concentration of G is doubled keeping the concentration of H fixed, the rate is doubled.
$R a t e equals open square brackets G close square brackets to the power of 1 end exponent$
then, $R a t e equals open square brackets G close square brackets to the power of 1 end exponent open square brackets H close square brackets to the power of 2 end exponent$

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