JEE Main 2026 · 4 Apr · Shift 1 · Chemistry Q57

ChemistrySingle correct+4 / -1Question 57 of 75

Consider the first order reaction $\ce{R -> P}$ .
The fraction of molecules decomposed in the given first order reaction can be expressed as

1-e^{k_1t}

1+e^{k_1t}

1+e^{-k_1t}

1-e^{-k_1t}

Answer and worked solution

Official answer: D

First order. $[R]=[R]_0e^{-k_1t}$ , so the fraction decomposed is $1-e^{-k_1t}$ .

(D)

Topics:Integrated rate equations

JEE Main 2026 · 4 Apr · Shift 1, Chemistry question 57