Solutions Book Back Questions 10th Science Lesson 9

10th Science Lesson 9

9] Solutions

Book Back Questions with Answer and Do You Know Box Content

Do You Know?

The effect of pressure on the solubility of a gas in liquid is given by Henry’s law. It states that, the solubility of a gas in a liquid is directly proportional to the pressure of the gas over the solution at a definite temperature.

Choose the best answers:

1. A solution is a ________________ mixture.

(a) Homogeneous

(b) Heterogeneous

(c) Homogeneous and heterogeneous

(d) Non homogeneous

2. The number of components in a binary solution is ______________

(a) 2

(b) 3

(c) 4

(d) 5

3. Which of the following is the universal solvent?

(a) Acetone

(b) Benzene

(c) Water

(d) Alcohol

4. A solution in which no more solute can be dissolved in a definite amount of solvent at a given temperature is called ______________

(a) Saturated solution

(b) Un saturatedsolution

(c) Super saturated solution

(d) Dilutesolution

5. Identify the non aqueous solution.

(a) Sodium chloride in water

(b) Glucose in water

(c) Copper sulphate in water

(d) Sulphur in carbon – di – sulphate

6. When pressure is increased at constant temperature the solubility of gases in liquid __________________

(a) No change

(b) Increases

(c) Decreases

(d) No reaction

7. Solubility of NaCl in 100 ml water is 36 g. If 25 g of salt is dissolved in 100 ml of water how much more salt is required for saturation ________________

(a) 12 g

(b) 11 g

(c) 16 g

(d) 20 g

8. A 25% alcohol solution means

(a) 25 ml alcohol in 100 ml of water

(b) 25 ml alcohol in 25 ml water

(c) 25 ml alcohol in 75 ml of water

(d) 75 ml alcohol in 25 ml water

9. Deliquescence is due to ____________

(a) Strong affinity to water

(b) Less affinity to water

(c) Strong hatred to water

(d) Inertness to water

10. Which of the following is hygroscopic in nature?

(a) Ferric chloride

(b) Copper sulphate penta hydrate

(c) Silica gel

(d) None of the above

Fill in the blanks:

1. The component present in lesser amount, in a solution is called ______________

1. solvent
2. solute
3. solution
4. none of the above

2. Example for liquid in solid type solution is _____________

1. aqueous
2. non aqueous
3. amalgam
4. none of the above

3. Solubility is the amount of solute dissolved in ___________ g of solvent.

1. 10
2. 100
3. 1000
4. None of the above

4. Polar compounds are soluble in ___________________ solvents.

1. Non polar
2. Polar
3. Bi polar
4. None of the above

5. Volume percentage decreases with increases in temperature because _____________

1. Of expansion of gas
2. Of contraction of gas
3. Of expansion of liquid
4. Of contraction of liquid

Match the following:

1. Blue vitriol – CaSO₄.2H₂O

2. Gypsum – CaO

3. Deliquescence – CuSO₄.5H₂O

4. Hygroscopic – NaOH

State true or false. If false, correct the statement:

1. Solutions which contain three components are called binary solution.

2. In a solution the component which is present in lesser amount is called solvent.

3. Sodium chloride dissolved in water forms a non-aqueous solution.

4. The molecular formula of green vitriol is MgSO₄.7H₂O

5. When Silica gel is kept open, it absorbs moisture from the air, because it is hygroscopic in nature.

Answers:

Choose the best answer:

1.Homogenous 2. 2 3. Water 4. Saturated Solution 5. Sulphur in Carbon di sulphide 6.I

1. increases 7. 11g

8. 25 ml of alcohol in 75ml of water 9. Strong affinity to water 10.

1. Silica gel

Fill in the blanks:

• 1.Solute 2. Amalgam 3. 100 4. Polar 5. of expansion of liquid
• Match the following:

1. CuSO₄.5H₂O 2. CaSO₄.2H₂O 3. NaOH 4. CaO

• True or False:
• False – Solutions which contain two components are called binary solution.
• False – In a solution the component which is present in lesser amount is called solute.
• False – Sodium chloride dissolved in water forms an aqueous solution.
• False – The molecular formula of green vitriol is FeSO₄. 7H₂O
• True