REACTION KINETICS

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Created on By buzzerkings

REACTION KINETICS

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If a reaction with t½  69.3 s has a rate constant value of 10^-2 per second, the order of the reaction is:

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At low temperature, the reaction CO(g)+NO2(g) CO2(g)+NO(g) is zero order in CO and second order in NO2. The rate law is, rate=

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A reaction involving two different reactants can never be:

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The following mechanism has been proposed for the reaction of NO with Br2 to form NOBr:

Step I NO(g)+ Br2(g) NOBr2(g) 

Step II  NOBr2(g) + NO(g) (slow) 2NOBr(g) 

If the second step is the rate determining step, the order of the reaction with respect to NO(g) is:

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The rate law of a reaction, A+B Product is rate = k[A]n[B]m. On doubling the concentration of A and halving the concentration of B, the ratio of new rate to the earlier rate of reaction will be:

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The rate constant of a reaction is 3 x 10^-4 s^-1. The order of the reaction is: 

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What fraction of a reactant remains after 40 min if t½  is 20 min for a first order reaction? 

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The specific reaction rate of a first order reaction depends on:

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In the presence of a catalyst, the reaction enthalpy:

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A+2B→C, the rate equation for this reaction is given as

Rate = k[A][B]

If the concentration of A is kept the same but that of B is doubled what will happen to the rate itself?

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At a certain moment, in the reaction 2N2O5 4NO2+O2 ; N2O5 is decomposing at the rate of 108 mg dm^-3 s^-1. The production rate of NO2 is:

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A catalyst:

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If the temperature of a reaction is increased from 25°C to 75°C:

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D17.The plot of log k vs. 1/T is linear with a slope of:

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The reaction rate increases with rise in temperature due to:

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50% of a zero order reaction completes in 10 min. 100% of the same reaction shall complete in:

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In a first order reaction, the concentration of the reactants is reduced to 25% in one hour. The half- life period of the reaction is:

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The time required for 100% completion of a first order reaction at constant temperature is:

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The half-life period of a first order reaction is 6.93 minutes. The time required for the completion of 99% of the chemical reaction will be: 

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A second-order reaction, where a = b is, 20% complete in 500s. How long will it take for the reaction to go for 60% completion?

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Time required for 100% completion of a zero-order reaction is:

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Reaction in which molecularity is equal to or more than three are uncommon because the probability of three or more molecules colliding at an instant is:

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For an elementary process of a chemical reaction: 

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The overall order of the reaction (CH3CO)2O + 2C2H5OH2CH3COOC2H5+ H2O

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If the rate law for a reaction is, rate = k[A][B]2, the units for k would be:

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The unit of the rate constant depends upon the: 

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For a first-order reaction, the units of Arrhenius factor 

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The rate equation for the reaction; 2A+B→C is rate = k[A][B]. The correct statement about this is:

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When concentration of a reactant is double, the rate of reaction becomes half. The order of reaction with respect to that substance is:

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If the activation energy for an exothermic reaction is 50 kJ/mol, what is the activation energy for the reverse reaction?

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In the presence of a catalyst, the heat evolved or absorbed during the reaction:

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The activation energy for the decomposition of nitrosyl chloride is 100 kJ. 

NOCl(g) → NO(g)+ ½ Cl2(g)  H = 38 kJ 

What is the activation energy for the reverse reaction? 

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In which of the following reactions, the molecularity and order can never be same?

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The rate of reaction doubles when the concentration of the reactant is increased four times. The order is:

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The energy of activation of a forward reaction is 50kcal. The energy of activation of its backward reaction is:

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The units of rate constant is: 

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The chemical reactions with very high Ea values are generally:

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Half-life of 10g of a radioactive isotope is 10 days. The half-life of 20g is:

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A zero order reaction is one in which:

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Inversion of cane sugar in dilute acid (conversion into glucose and fructose) is:

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Order of a reaction depends on:

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The hydrolysis of an ester in an acid is:

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Which of the following does not influence the rate of a reaction?

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The rate constant of a reaction is 3 x 10^ s-¹. The order of the reaction is:

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