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In a first order reaction, reactant concentration 'C' varies with time 't' as

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C decreases with 1t
log C decreases with 1t
1Cincreases linearly with t
log C decrease linearly with r

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detailed solution

Correct option is D

For first order reaction,k⋅t2.303=logC0−log[C]or,              log[C]=logC0−k⋅t2.303∴Plot of log [C] vs t is a straight with negative slope.

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