COMPLETE CHAPTER IN 40 MINUTES

A first order reaction is one-fifth completed in 40 minutes. The time reuired for its 100% completion is :

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A body cools from 50^(@)C to 46^(@)C in 5 minutes and to 40^(@)C in the next 10 minutes. The surrounding temperature is :

A first order reaction is 40% completed in 50 minutes. What is the time required for 90% of the reaction to complete?

An athlete complete one round of a circular track of diameter 200m in 40s. What will be the distance covered and the displacement at the end of 2 minutes ?

If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately ( in minutes)... (Take :log2=0.3;log2.5=0.40 )

If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes ) .............. (Take : log 2 = 0.30 , log 2.5 = 0.40)