MEDIUMMCQ SINGLEIChO (Chemistry Olympiad)Physical ChemistryChemical kineticsOrder and Molecularity of Reactions

Which of the following statements is false?

A.For a first order reaction, the rate of reaction

B.Active mass of 64g of HI present in a two-litre

C.For zero-order reaction, the rate changes with

D.Both order and molecularity of a reaction are✓ Correct

Explanation

Option d is false as order and molecularity of reaction are same only for elementary. Option c is correct as for zero-order reaction, R =k Reactant Rate = k and k varies with temperature. Option b is correct, as in present level of study we deal with dilute solutions where active mass = concentration. Thus, number of moles 64 1 0.25 Volume 128 2 4 HI x So, option b is correct. Option a is correct as 1 R= k Reactant

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