1
JEE Main 2020 (Online) 5th September Evening Slot
+4
-1
The rate constant (k) of a reaction is measured at differenct temperatures (T), and the data are plotted in the given figure. The activation energy of the reaction in kJ mol–1 is :
(R is gas constant)
A
R
B
2R
C
$${1 \over R}$$
D
$${1 \over {2R}}$$
2
JEE Main 2020 (Online) 5th September Morning Slot
+4
-1
A flask contains a mixture of compounds A and B. Both compounds decompose by first-order kinetics. The half-lives for A and B are 300 s and 180 s, respectively. If the concentrations of A and B are equal initially, the time required for the concentration of A to be four times that of B(in s) :
(Use ln 2 = 0.693)
A
180
B
120
C
300
D
900
3
JEE Main 2020 (Online) 3rd September Evening Slot
+4
-1
For the reaction
2A + 3B + $${3 \over 2}$$C $$\to$$ 3P, which statement is correct ?
A
$${{d{n_A}} \over {dt}} = {{d{n_B}} \over {dt}} = {{d{n_C}} \over {dt}}$$
B
$${{d{n_A}} \over {dt}} = {2 \over 3}{{d{n_B}} \over {dt}} = {3 \over 4}{{d{n_C}} \over {dt}}$$
C
$${{d{n_A}} \over {dt}} = {3 \over 2}{{d{n_B}} \over {dt}} = {3 \over 4}{{d{n_C}} \over {dt}}$$
D
$${{d{n_A}} \over {dt}} = {2 \over 3}{{d{n_B}} \over {dt}} = {4 \over 3}{{d{n_C}} \over {dt}}$$
4
JEE Main 2020 (Online) 3rd September Morning Slot
+4
-1
It is true that :
A
A first order reaction is always a single step reaction
B
A zero order reaction is a multistep reaction
C
A zero order reaction is a single step reaction
D
A second order reaction is always a multistep reaction
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