The answer to each of the following questions is a single digit integer, ranging from 0 to 9. If the correct answer to the question numbers A,B,C and D (say) are 4,0,9, and 2 respectively. Then the correct darkening of bubbles should be as shown on the slide.
For a first order reaction, the number of half lives required for the initial concentration of the reactant to fall to `3.125 %` if its initial concentration.....

Answer

`(D) arr 5`

Explanation

For every `10^(@)C` , the rate of reaction is doubled Hence for increase of `30^(@)C`, rate will become `2^(3) =8` times.