1
JEE Main 2020 (Online) 2nd September Evening Slot
+4
-1
The results given in the below table were obtained during kinetic studies of the following reaction

2A + B $$\to$$ C + D
X and Y in the given table are respectively :
A
0.3, 0.4
B
0.4, 0.3
C
0.4, 0.4
D
0.3, 0.3
2
JEE Main 2020 (Online) 9th January Morning Slot
+4
-1
For the following reactions
$$A\buildrel {700K} \over \longrightarrow {\mathop{\rm Product}\nolimits}$$
$$A\mathrel{\mathop{\kern0pt\longrightarrow} \limits_{catalyst}^{500K}} {\mathop{\rm Product}\nolimits}$$
it was found that 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):
A
198 kJ/mol
B
135 kJ/mol
C
105 kJ/mol
D
75 kJ/mol
3
JEE Main 2020 (Online) 8th January Evening Slot
+4
-1
Consider the following plots of rate constant versus $${1 \over T}$$ for four different reactions. Which of the following orders is correct for the activation energies of these reactions?

A
Ec > Ea > Ed > Eb
B
Ea > Ec > Ed > Eb
C
Eb > Ea > Ed > Ec
D
Eb > Ed > Ec > Ea
4
JEE Main 2020 (Online) 8th January Morning Slot
+4
-1
The rate of a certain biochemical reaction at physiological temperature (T) occurs 106 times faster with enzyme than without. The change in the activation energy upon adding enzyme is :
A
+ 6RT
B
– 6 (2.303)RT
C
– 6RT
D
+ 6(2.303)RT
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