Solutions Class 12th

For a solution between n-hexane and n-heptane following is/are correct

• PA = PA0 X A AND PB= PB0 X B

• ∆mix H = 0

• both 1 and 2 option

When the inter molecular forces of attraction between 1- 1, 2-2 and 1-2 are nearly equal it will form

• non ideal solution

• ideal solution

• saturated solution

Soda bottles are packed under high pressure

• to decrease the solubility of carbon dioxide gas in soda water

• to increase the solubility of carbon dioxide gas in soda water

• no effect on solubility of C0₂ in soda water

Acetone and carbontetrachloride form a non ideal solution showing

• positive deviation from Raoult's law

• negative deviation from Raoult's law

• none of the above

The partial vapour pressure of the gas in vapour phase p is _____________ proportional to the mole fraction of the gas x in the solution

• inversely

• equal

• directly

When scuba diver tries to come rapidly towards the surface of water , pressure decreased and dissolved N₂ gas comes back from the blood and make bubbles in his veins . It causes

• bends

• anoxia

• edema

To avoid bends diver use oxygen diluted with ____________ gas because it is less soluble in blood

• nitrogen

• helium

• CO₂

An Azeotrope

• boils at higher temperature

• has the same composition in the equilibrium vapour and liquid phases

• can be separated by simple distillation

Ethylene Glycol and water mixture is used in car radiators in cold countries why ?

• it lowers the freezing point of water

• it increases the freezing point of water

• it increases the boiling point of water

Higher is the value of Henry's law constant , the _______ is the solubility of the gas in the liquid

• greater

• lower

• no effect on solubility