Solutions (12th)

Mole fraction of glycerine C3H5(OH)3 in solution containing 36 g of water and 46 g of glycerine is

• 0.46

• 0,40

• 0,20

• 0.36

Out of molality (m), molarity (M), formality (F) and mole fraction (x), those which are independent of temperature are

• M,m

• F,x

• m,x

• M,x

Which of the following condition is not satisfied by an ideal solution?

• ΔHmixing = 0

• ΔVmixing = 0

• Raoult’s Law is obeyed

• Formation of an azeotropic mixture

The boiling point of an azeotropic mixture of water and ethanol is less than that of water and ethanol. The mixture shows

• no deviation from Raoult’s Law

• positive deviation from Raoult’s Law

• negative deviation from Raoult’s Law

• that the solution is unsaturated

Which has the lowest boiling point at 1 atm pressure?

• 0.1 M KCl

• 0.1 M Urea

• 0.1 M CaCl2

• 0.1 M A1Cl3

Osmotic pressure of a solution is 0.0821 atm at a temperature of 300 K. The concentration in moles/litre will be

• 0.33

• 0.666

• 0.3 × 10-2

• 3

People add sodium chloride to water while boiling eggs. This is to

• decrease the boiling point.

• increase the boiling point.

• prevent the breaking of eggs

• make eggs tasty.

The molal elevation constant depends upon

• nature of solute.

• nature of the solvent.

• vapour pressure of the solution

• enthalpy change.

The van’t Hoff factor (i) accounts for

• degree of solubilisation of solute.

• the extent of dissociation of solute

• the extent of dissolution of solute.

• the degree of decomposition of solution