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The rate of a chemical reaction is expressed either in terms of decrease in the concentration of reactants or increase in the concentration of a product per unit time. Rate of the reaction depends upon the nature of reactants, concentration of reactants, temperature, presence of catalyst, surface area of the reactants and presence of light. Rate of reaction is directly related to the concentration of reactant. Rate law states that the rate of reaction depends upon the concentration terms on which the rate of reaction actually depends, as observed experimentally. The sum of powers of the concentration of the reactants in the Rate law expression is called order of reaction while the number of reacting species taking part in an elementary reaction which must collide simultaneously in order to bring about a chemical reaction is called molecularity of the reaction. Answer the following questions:
Which among the following is a false statement?
The number of molecules that react with each other in an elementary reaction is a measure of the :
The initial concentration of N₂O₅ in the first order reaction : N₂O₅(g) → 2NO₂(g) + ½O₂(g) was 1·2 × 10⁻² mol L⁻¹. The concentration of N₂O₅ after 60 minutes was 0·2 × 10⁻² mol L⁻¹. Calculate the rate constant of the reaction at 318 K. [log 6 = 0·778]
Account for the following :
The rate of the chemical reaction doubles for an increase of 10 K in absolute temperature from 298 K. Calculate activation energy (Ea). [2·303 R = 19·15 JK⁻¹ mol⁻¹, log 2 = 0·3]
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