10th Science Book Back Answers Unit 9 – Solutions:
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Samacheer Kalvi 10th Science Book Back Answers Chemistry Unit 9 – Solutions:
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10th Science – Chemistry
Unit 9 – Solutions
I. Choose the best answer:
1. A solution is a mixture.
a) homogeneous b) heterogeneous
c) homogeneous and heterogeneous d) non-homogeneous
Ans : (a) homogeneous
2. The number of components in a binary solution is.
a) 2 b) 3 c) 4 d) 5
Ans : (a) 2
3. Which of the following is the universal solvent?
a) Acetone b) Benzene c) Water d) Alcohol
Ans : (c) Water
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) Unsaturated solution
c) Supersaturated solution d) Dilute solution
Ans : (a) Saturated solution
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–sulphide
Ans : (d) sulphur in carbon–di–sulphide
6. When pressure is increased at constant temperature the solubility of gases in liquid.
a) No change b) increases c) decreases d) no reaction
Ans : (b) increases
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) 12g b) 11g c) 16g d) 20g
Ans : (b) 11g (36–25)
8. A 25% alcohol solution means;
a) 25 ml alcohol in 100 ml of water b) 25 ml alcohol in 25 ml of water
c) 25 ml alcohol in 75 ml of water d) 75 ml alcohol in 25 ml of water
Ans : (c) 25 ml alcohol in 75 ml of 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
Ans : (a) Strong affinity to water
10. Which of the following is hygroscopic in nature?
a) ferric chloride b) copper sulphate pentahydrate
c) silica gel d) None of the above
Ans : (c) silica gel
II. Fill in the blanks:
1. The component present in a lesser amount, in a solution is called ____. Ans: solute
2. Example for liquid in a solid-type solution is ______. Ans: Mercury with sodium
3. Solubility is the amount of solute dissolved in __g of solvent. Ans: 100
4. Polar compounds are soluble in solvents. Ans: polar
5. Volume percentage decreases with increases in temperature because ____. Ans: expansion of liquid
III. Match the following:
Question.
| Blue vitriol | (a) CaSO4.2H2O |
| Gypsum | (b) CaO |
| Deliquescence | (c) CuSO4.5H2O |
| Hygroscopic | (d) NaOH |
Answer:
1 – (c), 2 – (a), 3 – (d), 4 – (b).
IV. True or False (Correct the Statement if it is false)
1. Solutions that contain three components are called binary solutions.
Ans: False. Solutions that contains two components are called a binary solution.
2. In a solution the component which is present in lesser amount is called solvent.
Ans: False. In a solution, the component which is present in higher amount is called solvent.
3. Sodium chloride dissolved in water forms a non-aqueous solution.
Ans: False. Sodium chloride dissolved in water forms an aqueous solution.
4. The molecular formula of green vitriol is MgSO4.7H2O.
Ans: False. The molecular formula of Epsom salt is MgSO4.7H2O.
5. When Silica gel is kept open, it absorbs moisture from the air, because it is hygroscopic in nature.
Ans: True.
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