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(a) For a first order reaction, show th...

(a) For a first order reaction, show that time required for 99% completion is twice the time required for the completion of 90% of reaction.
(b) Rate constant 'K' of a reaction varies with temperature 'T' according to the equation : `logK=logA-E_a/(2.303R)(1/T)`
Where `E_a` is the activation energy. When a graph is plotted for log k `Vs` `1/(T)` a straight line with a slope of -4250 K is obtained. Calculate `E_a` for the reaction.
(`R=8.314JK^(-1)mol^(-1)`)

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