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Question

Identify the reaction order from each of the following rate constants.
(i) k=2.3×105Lmol1s1
(ii) k=3×104s1

A
(i) First order (ii) Second order
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B
(i)Second order (ii) First order
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C
(i) Zero order (ii) First order
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D
None
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Solution

The correct option is B (i)Second order (ii) First order
(i) Rate of the reaction is given by,
Rate=k×[A]x, where x is the order of reaction
(molL)=2.3×105L(mol1)(s)1[A]x
(molL)2=constant(s1)[molL]x
Therefore, x=2 and the reaction is second order
(ii)Rate=k×[A]x, where x is the order of reaction
(molL)=3×104(s)1[A]x
(molL)=constant(s1)[molL]x
Therefore, x=1 and reaction is first order

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