The half-life period of a first-order reaction is 15   minutes . The amount of substance left after one…

The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be
  1. 1 1 6 of the original amount
  2. 1 8 of the original amount.
  3. 1 3 2 of the original amount.
  4. 1 4 of the original amount.

Solution

For the first-order reaction

A → Product

[A]t=[A0] 12Δtt1/2

         [A]t=A0126015=A0124

         ∴ [A]t=A016

Asked in: JEE Main 2014 (09 Apr Online)

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