1.

In a first order reaction, A+B to , If K is rate constant and initial concentration of the reactant A is 0.5M, then the half-life is

Answer»

(`log`2)/(k)
(LOG2)/(ksqrt(0.5))
`(IN2)/(k)`
`(0.693)/(0.5k)`

Solution :For a first order reaction `k=(2.303)/(t)"log"(a)/(a-x)`
When `t=t_((1)/(2))`
`k=(2.303)/(t_((1)/(2)))"log"(a)/(a-a//2)`
or, `t_((1)/(2))=(2.303)/(k)"log"_(10)2=(In2)/(k)`


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