1
JEE Main 2019 (Online) 10th January Evening Slot
+4
-1
For an elementary chemical reaction,

the expression for $${{d\left[ A \right]} \over {dt}}$$ is
A
2K1[A2] – K –1 [A]2
B
K1[A2] – K –1 [A]2
C
K1[A2] + K –1 [A]2
D
2K1[A2] – 2K –1 [A]2
2
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
Which of the graphs shown below does not represent the relationship between incident light and the electron ejected from metal surface ?
A
B
C
D
3
JEE Main 2019 (Online) 10th January Morning Slot
+4
-1
Consider the given plots for a reaction obeying Arrhenius equation (0oC < T < 300oC) : (K and Ea are rate constant and activation energy, respectively)

Choose the correct option :
A
I is right but II is wrong
B
Both I and II are correct
C
Both I and II are wrong
D
I is wrong but II is right
4
JEE Main 2019 (Online) 9th January Evening Slot
+4
-1
For the reaction, 2A + B $$\to$$ products, when the concentrations 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.
A
Total order of the reaction is 4
B
Order of the reaction with respect to B is 2
C
Order of the reaction with respect to B is 1
D
Order of the reaction with respect to A is 2
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