1
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)
2
JEE Main 2020 (Online) 4th September Morning Slot
Numerical
+4
-0
If 75% of a first order reaction was completed in 90 minutes, 60% of the same reaction would be completed in approximately (in minutes) _______.

(Take : log 2 = 0.30; log 2.5 = 0.40)
3
JEE Main 2020 (Online) 7th January Morning Slot
Numerical
+4
-0
During the nuclear explosion, one of the products is 90Sr with half life of 6.93 years. If 1 $$\mu$$ g of 90Sr was absorbed in the bones of newly born baby in placed of Ca, how much time, in years, is required to reduce much time, in year, is required to reduce it by 90% if it not lost metabolically.
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