Chemistry Class 10 Chapter 11 - Homeostasis - 3

Chemistry Class 10 Chapter 11 - Homeostasis - 3

1. which of the following are water soluble?

Polar substances
Ionic solids
All of these
Hydrogen bonded compounds

2. water that gives little lather or forms scum with soap is known as?

Light water
Soft water
Hard water
Heavy water

3. rainwater reacts with carbon dioxide in atmosphere to form?

Sulphuric acid
Hydrochloric acid
Carbonic acid
Hydrogen peroxide

4. the hardness of water that can be removed by boiling is known as?

Heavy hardness
Permanent hardness
Light hardness
Temporary hardness

5. hardness of water that can't be removed by boiling is known as?

Heavy hardness
Temporary hardness
Permanent hardness
Light hardness

6. which one of the following causes temporary hardness in water?

Chlorides of magnesium
Chlorides of calcium
Sulphates of calcium
Hydrogen carbonates

7. 2which type of water hampers cleaning action of soap?

Soft water
None of these
Hard water
Both of these

8. the white precipitate that the hard water forms with soap is known as?

Scum
None of these
Detergent
Lather

9. which one of the following is a correct statement?

Detergents react readily with calcium ions
Detergents persist in the environment
Detergents produce a scum
Detergents are biodegradable

10. temporary hardness of water can be removed by?

Boiling
Both of these
Adding slacked lime
None of these

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