1
JEE Main 2021 (Online) 24th February Morning Shift
Numerical
+4
-1
4.5 g of compound A (MW = 90) was used to make 250 mL of its aqueous solution. The molarity of the solution in M is x $$\times$$ 10-1.
The value of x is _______. (Rounded off to the nearest integer)
2
JEE Main 2020 (Online) 6th September Morning Slot
Numerical
+4
-0
In an estimation of bromine by Carius method, 1.6 g of an organic compound gave 1.88 g of AgBr. The mass percentage of bromine in the compound is _______.
(Atomic mass, Ag = 108, Br = 80 g mol–1)
3
JEE Main 2020 (Online) 5th September Morning Slot
Numerical
+4
-0
The minimum number of moles of O2 required for complete combustion of 1 mole of propane and 2 moles of butane is _____.
4
JEE Main 2020 (Online) 4th September Evening Slot
Numerical
+4
-0
Consider the following equations :
2Fe2+ + H2O2 $$\to$$ xA + yB
(in basic medium)
2MnO4- + 6H+ + 5H2O2 $$\to$$ x'C + y'D + z'E
(in acidic medium)
The sum of the stoichiometric coefficients x, y, x', y', and z' for products A, B, C, D and E, respectively, is ______.
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