1.

For a first order reaction, t_(av) (average life time), t_(50%) and t_(75%) are in the order :

Answer»

`t_(50)lt t_(av) lt t_(75),`
`t_(50)lt t_(75) lt t_(av),`
`t_(av)lt t_(50) lt t_(75),`
`t_(av)=t_(50) lt t_(75),`

Solution :`t_(av) = (1)/(k) = (1)/(0*693//t_(1//2)) = (t_(1//2))/(0*693)= 1*44 t_(50%)`
ALSO, we KNOW that `t_(75%) = 2 XX t_(50%)`
Hence, `t_(50%) lt t_(av) lt t_(75%)`


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