1
JEE Main 2020 (Online) 4th September Morning Slot
Numerical
+4
-0
The number of chiral centres present in [B] is _____. JEE Main 2020 (Online) 4th September Morning Slot Chemistry - Compounds Containing Nitrogen Question 120 English
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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)
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3
JEE Main 2020 (Online) 4th September Morning Slot
Numerical
+4
-0
At 300 K, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is 550 mm of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by 10 mm of Hg. What is the vapour pressure in mm Hg of n-heptane in its pure state ______?
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4
JEE Main 2020 (Online) 4th September Morning Slot
Numerical
+4
-0
A 20.0 mL solution containing 0.2 g impure H2O2 reacts completely with 0.316 g of KMnO4 in acid solution. The purity of H2O2 (in %) is _____________
(mol. wt. of H2O2 = 34; mol. wt. of KMnO4 = 158)
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