HARD
JEE Main
IMPORTANT
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For the following reactions
A700KProduct
Acatalyst500KProduct
It was found that the Ea is decreased by 30 KJ/mol in the presence of catalyst. If the rate remains unchanged, the activation energy for catalysed reaction is (Assume pre-exponential factor is same)

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Important Questions on Chemical Kinetics

MEDIUM
JEE Main
IMPORTANT
For the reaction, 2A+B products, when the concentration of A and B both were doubled, the rate of the reaction increased from 0.3 mol L-1s-1 to 2.4 mol L-1s-1.  When the concentration of A alone is doubled, the rate increased from 0.3 mol L-1s-1 to 0.6 mol L-1s-1.

Which one of the following statements is correct?
MEDIUM
JEE Main
IMPORTANT
The following results were obtained during kinetic studies of the reaction.

2A+B product
 
Experiment A in mol L-1 B  in mol L-1 Initial rate of reaction in mol L-1 min -1
I 0.10 0.20 6.93×10-3
II 0.10 0.25 6.93×10-3
III 0.20 0.30 1.386×10-2

The time (in minutes) required to consume half of A is
MEDIUM
JEE Main
IMPORTANT
Consider the given plot of enthalpy of the following reaction between A and B.
A+BC+D. Identify the incorrect statement.
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MEDIUM
JEE Main
IMPORTANT

The given plots represent the variation of the concentration of a reactant R with time for two different reactions (i) and (ii). The respective orders of the reaction are
(i) Question Image

(ii) Question Image

MEDIUM
JEE Main
IMPORTANT
The rate of a reaction quadruples when the temperature changes from 300 to 310K . The activation energy of this reaction is:

(Assume Activation energy and pre-exponential factor are independent of temperature; ln(2)=0.693; R=8.314 J mol-1K-1)
HARD
JEE Main
IMPORTANT
The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below:

O3g+ClO2g+ClOg ...(i)

ki=5.2×109 L mol-1 s-1

ClOg+OgO2g+Clg ...(ii)

kii=2.6×1010 L mol-1 s-1

The closest rate constant for the overall reaction

O3g+Og2O2g is:
HARD
JEE Main
IMPORTANT
The half-life period of a first-order reaction is 15 minutes. The amount of substance left after one hour will be
MEDIUM
JEE Main
IMPORTANT
Consider the following plots of rate constant versus 1T for four different reactions. Which of the following orders is correct for the activation energies of these reactions?
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