The volume concentration of hydrogen peroxide having 6.8% concentration will be

• 5

• 11.2

• 22.4

• 20

The volume of oxygen evolved at STP by decomposition of 0.68 g '20 volume' hydrogen peroxide solution is

• 2.24mL

• 22.4mL

• 224mL

• 2240mL

What is the molality of a solution containing 200 mg of urea (molar mass 60 g mol^-1) dissolved in 40 g of water?

• 0.0825

• 0.825

• 0.498

• 0.0013

What is the mass of one molecule of yellow phosphorus? (Atomic mass, P = 30)

• 1.993 × 10^-22 kg

• 1.993 × 10^-19 mg

• 4.983 × 10^-20 kg

• 4.983 × 10^-23 mg

What is the volume of water consumed during acid hydrolysis of 1.368 kg of sucrose?

(Given : molar masses of sucrose = 342, water = 18, density of water = 1g/cm³)

• 0.072 dm³

• 0.070 dm³

• 0.18 dm³

• 0.018 dm³

Molarity is defined as

• the number of moles of solute dissolved in 1 dm³ of the solution

• the number of moles of solute dissolved in 1 kg of solvent

• the number of moles of solute dissolved in 1 dm³ of the solvent

• the number of moles of solute dissolved in 100 ml of the solvent

For which among the following equimolar aqueous solutions Van't Hoff factor has the lowest value?

• Aluminium chloride

• Potassium sulphate

• Ammonium chloride

• Urea

The molality of the 3M solution of methanol if the density of the solution is 0.9 g cm^-3 is

• 3.73

• 3.0

• 3.33

• 3.1

10 g of MgCO₃ decomposes on heating to 0.1 mole CO₂ and 4 g MgO. The percent purity of MgCO₃ is

• 24%

• 44%

• 84%

• 74%

60.

The compound Na₂CO₃ . x H₂O has 50% H₂O by mass. The value of "x" is

• 4

• 5

• 6

• 8