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NEET levelSingle correct optionDifficulty 1 of 3ck002

For the elementary reaction $2 A + B products$ , the rate law and the molecularity are

Arate $= k [A]^{2} [B]$ , molecularity $= 3$
Brate $= k [A] [B]$ , molecularity $= 2$
Crate $= k [A]^{2} [B]$ , molecularity $= 2$
Drate $= k [A] [B]^{2}$ , molecularity $= 3$

Answer: A

For an elementary step the exponents in the rate law equal the stoichiometric coefficients of the reactants. Hence rate

= k [A]^{2} [B]

. Molecularity is the number of species colliding:

2 + 1 = 3

.

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