1.

The time taken for 10% completion of a first order reaction is 20 min . Then for 19% completion the reaction will take :

Answer»

40 MINS
60 mins
30 mins
50 mins

Solution :(A)`K= (2.303)/(20) "log" (100)/(81) `
`k = (2.303)/(x) "log" (100)/(81)`
since (i) = (II)
`(2.303)/(20)"log" (100)/(90) = (2.303)/(x) "log" (100)/(81)`
`x= (20 "log"(100)/(81))/("log" (100)/(90))`
`= (20xx0.0915)/(0.046) = 40 ` min


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