1
JEE Main 2022 (Online) 24th June Morning Shift
Numerical
+4
-1

A 0.166 g sample of an organic compound was digested with conc. H2SO4 and then distilled with NaOH. The ammonia gas evolved was passed through 50.0 mL of 0.5 N H2SO4. The used acid required 30.0 mL of 0.25 N NaOH for complete neutralization. The mass percentage of nitrogen in the organic compound is ____________.

2
JEE Main 2021 (Online) 1st September Evening Shift
Numerical
+4
-1
The number of atoms in 8g of sodium is x $$\times$$ 1023. The value of x is ____________. (Nearest integer)

[Given : NA = 6.02 $$\times$$ 1023 mol$$-$$1

Atomic mass of Na = 23.0 u]
3
JEE Main 2021 (Online) 1st September Evening Shift
Numerical
+4
-1
If 80 g of copper sulphate CuSO4 . 5H2O is dissolved in deionised water to make 5L of solution. The concentration of the copper sulphate solution is x $$\times$$ 10$$-$$3 mol L$$-$$1. The value of x is _____________.

[Atomic masses Cu : 63.54u, S : 32u, O : 16u, H : 1u]
4
JEE Main 2021 (Online) 31st August Evening Shift
Numerical
+4
-1
Sodium oxide reacts with water to produce sodium hydroxide. 20.0 g of sodium oxide is dissolved in 500 mL of water. Neglecting the change in volume, the concentration of the resulting NaOH solution is ______________ $$\times$$ 10$$-$$1 M. (Nearest integer) [Atomic mass : Na = 23.0, O = 16.0, H = 1.0]
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