Chemistry Water Important Questions
Q1
Fill in the Blanks
1. Water is a ....... compound.
2. The process of losing water of crystallization is called ....
3. A substance that readily absorbs moisture from the air is called a .......
4. Hard water is ......... water with a high content of calcium and magnesium salts.
5. Soft water is ........ water with a low content of calcium and magnesium salts.
6. The solubility of a substance is the maximum amount of that substance that can be
dissolved in a given amount of solvent at a specific temperature.
7. Water of crystallization is the ........ in a hydrated compound that is chemically bound to the other components.
Solution :
Q2
Multiple Choice Questions
1. Which of the following substances is not a hydrate?
(a) CuS04•5H20
(b) Na2S04
(c) CaC12•2H20
(d) NaCl
2.
Which of the following substances is a deliquescent?
(a) CaC12
(b) MgS04
(c) CuS04•5H20
(d) NaCl
3.
Which of the following substances is an efflorescence?
(a) Na2S04• 10H20
(b) CuS04•5H20
(c) MgS04•7H20
(d) NaCl
4. Which of the following substances is hard water?
(a) Rainwater
(b) Distilled water
(c) Water that contains calcium and magnesium
salts
(d) Water that is soft
5. Which of the following substances is soft water?
(a) Rainwater
(b) Distilled water
(c) Water that contains calcium and magnesium
salts
(d) Water that is hard
Solution :
1.(d) NaCl
2.(a) CaCl2
3. (a) Na2S04• 10H20
4.(c) Water that contains calcium and magnesium
salts
5. (a) Rainwater
Q3
Match the Column
Q4
Long Questions
(a) Explain the difference between efflorescence and deliquescence.
(b) Give two
examples of efflorescent substances and two examples of deliquescent
substances.
Solution :
Q5
(a) What is hard water?
(b) What are the causes of hard water? (c) What are the
problems associated with hard water?
Solution :
Q6
(a) What is solubility?
(b) Factors that affect the solubility of a substance.
(c)
Explain the concept of saturation.
Solution :
Q7
(a) What is water of crystallization?
(b) How is water of crystallization
determined?
(c) What is the role of water of crystallization in the formation of
crystals?
Solution :
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