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1
JEE Main 2021 (Online) 24th February Morning Slot
Numerical
+4
-1
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Gaseous cyclobutene isomerises to butadiene in a first order process which has a 'k' value of 3.3 $$ \times $$ 10-4 s-1 at 153°C. The time in minutes it takes for the isomerization to proceed 40% to completion at this temperature is ______.
(Rounded off to the nearest integer)
Your input ____
2
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
If the solubility product of AB2 is 3.20 $$ \times $$ 10–11 M3, then the solubility of AB2 in pure water is _____ $$ \times $$ 10–4 mol L–1.
[Assuming that neither kind of ion reacts with water]
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3
JEE Main 2020 (Online) 6th September Evening Slot
Numerical
+4
-0
The rate of a reaction decreased by 3.555 times when the temperature was changed from 40oC to 30oC. The activation energy (in kJ mol–1) of the reaction is _______.

Take; R = 8.314 J mol–1 K–1 ln 3.555 = 1.268
Your input ____
4
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
The number of molecules with energy greater than the threshold energy for a reaction increases five fold by a rise of temperature from 27oC to 42oC. Its energy of activation in J/mol is _____.
(Take ln 5 = 1.6094; R = 8.314 J mol–1 K–1)
Your input ____
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