JEE Main 2026 Apr 4 Shift 1, Chemistry Q7: Reactions of Various Orders

JEE Main2026Apr 4, Shift 1Chemistry

Consider the first order reaction $R \to P$ . The fraction of molecules decomposed in the given first order reaction can be expressed as

Solution

For a first order reaction with initial concentration $a$ and concentration of reactant remaining $(a - x)$ after time $t$ :

$a - x = a e^{- k_{1} t} .$

Fraction decomposed $= \frac{x}{a} = 1 - e^{- k_{1} t} .$

Concept behind this question

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