#### Solutions Four and Seven Marks Questions

10th Standard

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Science

Time : 01:00:00 Hrs
Total Marks : 55
5 x 4 = 20
1. Write notes on
i) saturated solution
ii) unsaturated solution

2. Write notes on various factors affecting solubility

3. a) What happens when MgSO4.7H2O is heated? Write the appropriate equation
b) Define solubility

4. A solution is prepared by dissolving 45 g of sugar in 180 g of water. Calculate the mass percentage of solute.

5. 3.5 litres of ethanol is present in 15 litres of aqueous solution of ethanol. Calculate volume percent of ethanol solution.

6. 5 x 7 = 35
7. 1.5 g of solute is dissolved in 15 g of water to form a saturated solution at 298K. Find out the solubility of the solute at the temperature.

8. The Solubility of sodium nitrate at 50°C and 30°C is 114 g and 96 g respectively. Find the amount of salt that will be thrown out when a saturated solution of sodium nitrate containing 50 g of water is cooled from 50°C to 30°C?

9. A solution was prepared by dissolving 25 g of sugar in 100 g of water. Calculate the mass percentage of solute.

10. 16 grams of NaOH is dissolved in 100 grams of water at 25°C to form a saturated solution. Find the mass percentage of solute and solvent.
(i) Mass of the solute (NaOH) = 16 g
(ii) Mass of the solvent H2O = 100 g

11. Find the amount of urea which is to be dissolved in water to get 500 g of 10 % w / w aqueous solution?