JEE Main 2014 · 9 Apr · Shift 1 · Chemistry Q36

ChemistrySingle correct+4 / -1Question 36 of 90

The half-life period of a first order reaction is 15 minutes. The amount of substance left after one hour will be :

\frac14

of the original amount

\frac18

of the original amount

\frac1{16}

of the original amount

\frac1{32}

of the original amount

Answer and worked solution

Official answer: C

One hour is 4 half-lives, so the fraction left is $\left(\frac12\right)^4=\frac1{16}$ .

JEE Main 2014 · 9 Apr · Shift 1, Chemistry question 36