391.

How many millilitres of 20 volume H₂O₂ solution is needed to react completely with 500 mL of acidified 1 N KMnO₄ solution?

• 224

• 280

• 140

• 56

The molarity of a solution made by mixing 50mL of conc. H₂SO₄ (36N) with 50mL of water, is

• 36M

• 18M

• 9M

• 6M

171g of sugar cane (C₁₂H₂₂O₁₁) is dissolved in 1 L of water. The molarity of the solution is

• 2.0 M

• 1.0 M

• 0.5 M

• 0.25 M

The volume of 0.1 M H₂SO₄ that is needed to completely neutralise 30mL of 0.2 M NaOH solution, is

• 15mL

• 30mL

• 40mL

• 60mL

1 moles of crystalline NaCl will have how many unit cells ?

• 1.506 × 10²³

• 3.012 × 10²³

• 4.518 × 10²³

• 6.023 × 10²³

A mixture has 18g water and 414g ethanol. The mole fraction of water in mixture is (assume ideal behaviour of the mixture)

• 0.1

• 0.4

• 0.7

• 0.9

If an organic compound has C = 40%, H = 13.3% and N = 46.67%, then the empirical formula of this compound is

• CH₄N

• C₂H₈N₂

• CH₃N

• None of these

Which of the following units of energy, represents maximum amount of energy?

• Calorie

• Joule

• Erg

• Electron volt

A compound has the empirical formula CH₂O. Its vapour density is 30. Its molecular formula is

• C₂H₄O₂

• C₂H₆O

• C₂H₆O₂

• C₂H₄O

Combustion of liquid benzene in oxygen occurs as 2C₆H₆ + 15O₂ → 12CO₂ + 6H₂O. At STP, what volume (in litre) of oxygen is required for the full combustion of 3.9 g liquid benzene?

• 11.2 L

• 22.4 L

• 8.4 L

• 7.4 L