1
JEE Main 2019 (Online) 12th January Evening Slot
+4
-1
For a reaction consider the plot of $$\ell$$n k versus 1/T given in the figure. If the rate constant of this reaction at 400 K is 10–5 s–1, then the rate constant at 500 K is –

A
10$$-$$4 s$$-$$1
B
4 $$\times$$ 10$$-$$4 s$$-$$1
C
10$$-$$6 s$$-$$1
D
2 $$\times$$ 10$$-$$4 s$$-$$1
2
JEE Main 2019 (Online) 12th January Morning Slot
+4
-1
Decomposition of X exhibits a rate constant of 0.05 $$\mu$$g/year. How many year are required for the decomposition of 5$$\mu$$g of X into 2.5 $$\mu$$g?
A
50
B
20
C
25
D
40
3
JEE Main 2019 (Online) 11th January Evening Slot
+4
-1
The reaction 2X $$\to$$ B is a zeroth order reaction. If the initial concentration of X is 0.2 M, the half-life is 6 h. When the initial concentration of X is 0.5 M, the time required to reach its final concentration of 0.2 M will be:
A
18.0 h
B
9.0 h
C
7.2 h
D
12.0 h
4
JEE Main 2019 (Online) 11th January Morning Slot
+4
-1
If a reaction follows the Arrhenius equation, the plot ln k vs $${1 \over {\left( {RT} \right)}}$$ gives straight line with a gradient ($$-$$ y) unit.

The energy required to active the reactant is :
A
y unit
B
y/R unit
C
yR unit
D
$$-$$y unit
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