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Give the characteristics of first order reaction. |
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Answer» Solution :(i) When the concentration of the reactant is increased by 'n' times, the rate of reaction is also increased by n times. That is, if the concentration of the reactant is doubled, the rate is doubled. (ii)The UNIT of rate constant of a first order reaction is `sec^(-1)` or `"time"^(-1)`. `k_(1)=("rate")/((a-x))=("mol lit"^(-1)sec^(-1))/("mol lit"^(-1))` (iii) The time required to complete a definite FRACTION of reaction is independent of the initial concentration, of the reactant if `t_(1//u)` is the time of one 'u' th fraction of reaction to take PLACE then from equation. `k_(1)=(2.303)/(t)"log"(a)/(a-x)` `x=(a)/(u)` and `t_(1//u)=(2.303)/(k_(1))"log"(a)/(a-(a)/(u))`, `t_(1//u)=(2.303)/(k_(1))"log"(u)/((u-1))` SINCE, `k_(1)=` rate constant, `t_(1//u)` is independent of initial concentration 'a'. |
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