The oxide of a metal contains 40% of oxygen. The valency of metal is 2. What is the atomic weight of metal?

• 24

• 13

• 40

• 36

Which of the following reactions does not take place?

• F₂ + 2Cl^- → 2F^- + Cl₂

• Br₂ + 2I^- → 2Br^- + I₂

• Cl₂ + 2Br^- → 2Cl^- + Br₂

• Cl₂ + 2F^- → 2Cl^- + F₂

What weight of hydrated oxalic acid should be added for complete neutralisation of 100 mL of 0.2 N -NaOH solution?

• 0.45 gm

• 0.90 gm

• 1.08 gm

• 1.26 gm

134.

The number of moles of a solute in its solution is 20 and total number of moles are 80. The mole fraction of solute is

• 2.5

• 0.25

• 1

• 0.75

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