Question

# Which of the following(s) is/are true for the given elementary reaction? 3A+12B+2C→32X+2Y

A
Order of the reaction is 112
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B
Rate law is
K[A]3[B]12[C]2
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C
Sum of stoichiometric coefficient is not equal to order of reaction
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D
Rate law is
K[X]32[Y]2
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Solution

## The correct option is B Rate law is K[A]3[B]12[C]2For irreversible reaction, rate of reaction only depends on the concentration of reactants only. Generally they do not depend on product concentration. Thus, the rate of reactioon is proportional to concentratiom of reactants. The representation of rate of reaction in terms of the concentration of the reactants is called rate law. R=K(Concentration)order Order of a reaction: For a given reaction: aX+bY+cZ→Products If, Rate∝[X]p[Y]q[Z]r Overall order of the reaction is : (p+q+r) Rate=K[X]p[Y]q[Z]r For elementary reaction (Reaction involves only single step): The sum of stoichiometric coefficients is equal to the order of the reaction. Thus, for 3A+12B+2C→32X+2Y Order of reaction is: 3+12+2=112 Rate law of reaction is R=K[A]3[B]12[C]2

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