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MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical kineticsPrevious Year Questions

In a first-order reaction A B -> , if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is. (AIPMT 2007)

A.log 2

B.log 2

C.ln 2✓ Correct

D.0.693

Explanation

For a first order reaction 10 2.303log a k t a x When 1/2 t t 10 1/2 2.303log / 2 a k t a a Or 1/2 10 2.303 ln 2 log 2 t k k

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