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
$$\underline A \,\,\buildrel {4KOH,{O_2}} \over \longrightarrow \,\,\mathop {2\underline B }\limits_{\left( {Green} \right)} \,\, + \,\,2{H_2}O$$

$$3\underline B \,\,\buildrel {4HCl} \over \longrightarrow \,\,\mathop {2\underline C }\limits_{\left( {Purple} \right)} \,\, + \,\,Mn{O_2} + 2{H_2}O$$

$$2\underline C \,\,\buildrel {{H_2}O.KI} \over \longrightarrow \,\,\mathop {2\underline A }\limits_{\left( {Purple} \right)} \,\, + \,\,2KOH\,\, + \,\,\underline D$$

In the above sequence of reactions, $${\underline A }$$ and $${\underline D }$$, respectively, are :
A
Kl and KMnO4
B
Kl and K2MnO4
C
KlO3 and MnO2
D
MnO2 and KlO3
4
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
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