1
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
$${{d{n_A}} \over {dt}} = {2 \over 3}{{d{n_B}} \over {dt}} = {4 \over 3}{{d{n_C}} \over {dt}}$$
2
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
3
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
4
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
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