A first order reaction has specific reaction rate 10<sup>-2</sup>s<sup>-1</sup>. How much time it will take for 20g of reactant to reduce to 5g?

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Ram Sharma

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Q. A first order reaction has specific reaction rate 10^-2s^-1. How much time it will take for 20g of reactant to reduce to 5g?

(A) 138.6 s
(B) 346.5 s
(C) 693.0 s
(D) 238.6 s

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✅ Correct Answer: (A) 138.6 s

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