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1
JEE Main 2021 (Online) 17th March Morning Shift
Numerical
+4
-1
The mole fraction of a solute in a 100 molal aqueous solution is ___________ $$\times$$ 10$$-$$2. (Round off to the Nearest Integer).

[Given : Atomic masses : H : 1.0 u, O : 16.0 u ]
2
JEE Main 2021 (Online) 16th March Evening Shift
Numerical
+4
-1
When 35 mL of 0.15 M lead nitrate solution is mixed with 20 mL of 0.12 M chromic sulphate solution, _________ $$\times$$ 10$$-$$5 moles of lead sulphate precipitate out. (Round off to the Nearest Integer).
3
JEE Main 2021 (Online) 16th March Morning Shift
Numerical
+4
-1
Complete combustion of 750 g of an organic compound provides 420 g of CO2 and 210 g of H2O. The percentage composition of carbon and hydrogen in organic compound is 15.3 and ___________ respectively. (Round off to the Nearest Integer).
$$2MnO_4^ - + b{C_2}O_4^{2 - } + c{H^ + } \to xM{n^{2 + }} + yC{O_2} + z{H_2}O$$