JEE Main 2026 · 5 Apr · Shift 1 · Chemistry Q75

ChemistryInteger+4 / -1Question 75 of 75

If the half life of a first order reaction is 6.93 minutes then the time required for completion of 99% of the reaction will be ________ minutes .

(Given : $\log 2 = 0.3010$ )

Your answer

Answer and worked solution

Official answer: 46

Rate constant. $k=\dfrac{0.693}{6.93}=0.1$ min $^{-1}$ .

99% completion.
$t=\frac{2.303}k\log\frac{100}1=\frac{2.303\times2}{0.1}=46.06\text{ min}.$

Answer: 46

JEE Main 2026 · 5 Apr · Shift 1, Chemistry question 75