Solutions

Samacheer Book Back Questions And Answers For Science Standard 10 “Solutions“

I. Choose the correct answer:
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 saturated solution
c. Super saturated solution
d. Dilute 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

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. 12g
b. 11g
c. 16g
d. 20g

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

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

II. Fill in the blanks:
1. The component present in lesser amount, in a solution is called _____.
2. Example for liquid in solid type solution is _____.
3. Solubility is the amount of solute dissolved in _____ g of solvent.
4. Polar compounds are soluble in _____ solvents.
5. Volume percentage decreases with increases in temperature because _____.

Answers:
1. Solute
2. Mercury with sodium (amalgam)
3. 100
4. polar
5. polar of expansion of liquids

III. Match the following:
1. Blue vitriol            A. CaSO₄ .2H₂O
2. Gypsum                B. CaO
3. Deliquescence      C. CuSO₄ .5H₂O
4. Hygroscopic          D. NaOH

Answers:
1. C
2. A
3. D
4. B

IV. True or False: (If false give the correct 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:
1. False (Solutions which contain three components are called Trinary solution)
2. True
3. True
4. False (The molecular formula of green vitriol is MgSO₄.7H₂O)
5. True

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