Recent questions tagged ch-4

In pseudo - uni molecular reactions:

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The ratio of the time required for $\large\frac{3}{4}$ th of the reaction of first order to complete to that required for half of the reaction

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Time required to decompose half of the substance for nth order reaction is inversely proportional to :

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A plot of log $(a-x) $ against time 't' is a straight line. This indicates that the reaction is of

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The order of reaction may be determined by

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The order reaction can be reduced from

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What is the order of the reaction which obeys the expression $t_{1/2} =1 /Ka$?

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For a zero order reaction :

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The unit of rate constant for a zero order reaction is

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A zero order reaction is one :

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The rate of the reaction, $A+B+C \to $ products , is given by $\large\frac{-d[A]}{dt} $$=k[A]^{1/2} [B]^{1/3} [C]^{1/4}$ The order of the reaction is

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If the rate of reaction between A and B is given by rate $=K[A][B]^2$ , then the reaction is :

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For the reaction $A \to B$ the rate of reaction is quadrupled when the concentration of A is doubled . the rate of the reaction is $r=k[A]^0$ the value of n is :

asked Sep 23, 2015 by meena.p

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For a reaction $2A+B \to C+D$ the concentration of B is kept constant and that of A is tripled the new rate of reaction will be :

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Rate expression of a chemical change is $ \large\frac{-dx}{dt}$$=K[A]^2[B][C]^0$. The order of reaction is

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Which of the following is a first order reaction /

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For which of the following ,the units of rate and rate constant of the reaction are identical ?

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A catalyst lowers the activation energy of the forward reaction by $10\;kg\;mol^{-1}$ what effect it has on the activation energy of the backward reaction ?

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First order reaction $2 N_2O_5 \to 4N0_2+0_2$ the half life period is given by

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Time taken for completion of a zero order reaction is

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Activation energy of a chemical reaction can be determined by

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Time required to decompose half of a substance for nth order reaction is inversely proportional to

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If doubling the initial concentration of a reactant doubles $t_{1/2}$ of the reaction, the order of the reaction is

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If for any reaction , the rate constant is equal to the rate of the reaction at all concentrations, the order is

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If the rate expression for a reaction is $dx/dt= K[A]^{1/2}[B]^{3/2}$ , the overall order of the reaction is

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A conversion of $A \to B$ follows second order kinetics . Doubling concentration of A will increase the rate of formation of B by a factor of

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In a second order reaction $2A => products $the concentration is halved . The half life of the reaction is

asked Sep 22, 2015 by meena.p

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The frequency factor becomes equal to rate constant of a reaction when the energy of activation is

asked Sep 22, 2015 by meena.p

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The substance which by its more presence increases the rate of a chemical reaction without itself undergoing any permanent chemical change is known as

asked Sep 22, 2015 by meena.p

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Consider A => products . In this reaction , increasing the concentration of A twice , the rate of reaction increased to 8 times . The order of the above reaction is

asked Sep 22, 2015 by meena.p

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Which order reaction obeys the expression $+_{1/2} =1/K[A]_0$ in chemical kinetics ?

asked Sep 22, 2015 by meena.p

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The half life period of a first order reaction is $138.6$ minute . The velocity constant of the reaction is

asked Sep 22, 2015 by meena.p

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A catalyst is a substance which

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The alkaline hydrolysis of an enter represented by $RCOOR+OH^{-} \to RCOO^{-} +R'OH$ is

asked Sep 22, 2015 by meena.p

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The half life of $N_20_5$ decomposition __________ increase of temperature .

asked Sep 22, 2015 by meena.p

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If the rate of a gaseous reaction is independent of pressure , the order of the reaction is

asked Sep 22, 2015 by meena.p

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The molecularity of a reaction is

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Which of the following has been used to explain the subject of chemical kinetics ?

asked Sep 22, 2015 by meena.p

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The terms - dn /dt in the rate expression refers to the

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The activation energy for a hypothetical reaction A => product is 12.49 k cal/mol if temperature is raised from 295 to 305 , the rate of reaction increases by

asked Sep 22, 2015 by meena.p

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The activation energy of a reaction can be lowered by

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The activation energy of a reaction is zero. The rate constant of the reaction :

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In order to react , a molecular at the time of collision , must posses a certain amount of energy known as

asked Sep 22, 2015 by meena.p

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According to Arrhenium equation rate constant of a chemical reaction is equal to :

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The temperature coefficient of most of the reactions lies between

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In general with every $10^{\circ}$ rise in temperature the rate of reaction becomes approximately

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The influence of temperature on the rate of reaction is determined by

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The activation energy for a chemical reaction depends upon

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According to collision theory :

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In the reaction $3A \to 2B$ , rate of reaction $+d[B]|dt$ is equal to

asked Sep 22, 2015 by meena.p

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