Class 12 Chemistry
Chapter 2 - Solutions
(Magical Series) Very Important Questions Set 2
Q.1. Gas (A) is more soluble in water than gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry's constant) and why?
Q.2. What concentration of nitrogen should be present in a glass of water at room temperature? Assume a temperature of 25°C, a total pressure of l atmosphere and mole fraction of nitrogen in air of 0.78. [KH for nitrogen= 8.42 × 10–7 M/mm Hg].
[Ans: 4.99 × 10–4]
Q.3. The partial pressure of ethane over a saturated solution containing 6.56 × 10–2 g of ethane is 1 bar. If the solution contains 5.0 × 10–2 g of ethane, then what will be the partial pressure of the gas?
[Ans: 0.762 bar]
Q.4. If N2 gas is bubbled through water at 293 K, how many millimoles of N2 gas would dissolve in 1 litre of water? Assume that N2 exerts a partial pressure of 0.987 bar. Given that Henry's law constant for N2 at 293 K is 76.48 k bar.
[Ans: 0.716 millimoles]
Q.5. Define Raoult's law. How is it formulated for solutions of non-volatile solutes?
Q.6. Name the solution which follows Raoult's law at all concentrations and temperatures.
Q.7. Define Ideal solution.
Q.8. In non-ideal solution, what type of deviation shows the formation of maximum boiling azeotropes?
Q.9. What are 'azeotropes'?
Q.10. Write two differences between ideal solutions and non-ideal solutions.
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