IIT-JEE 2007 · Paper 2 · Chemistry Q31

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ChemistrySingle correct+3 / -1Question 31 of 66

Consider a reaction aG + bH → Products. 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 order of the reaction is

Answer and worked solution

Official answer: D

Rate law $r=k[G]^x[H]^y$ .

Doubling G alone doubles the rate: $2^x=2$ , $x=1$ .
Doubling both multiplies it by 8: $2^{x+y}=8$ , so $x+y=3$ .

Overall order 3 (with $y=2$ ).

(D)

Topics:Order and molecularity Rate of reaction and rate law

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IIT-JEE 2007 · Paper 2, Chemistry question 31