Hard Water
Trending Questions
Give the disadvantages of hard water?
We use a solution of slaked lime to whitewash the walls. In the beginning the wall looks rough and coarse, but after 2 - 3 days the wall appears smooth and shiny. This is due to the formation of:
Calcium hydroxide
Calcium oxide
Calcium chloride
Calcium carbonate
aldehydes
ketones
sulphonic acids
carboxylic acids
Would you be able to check whether water is hard by using a detergent? Why?
Why are detergents better cleansing agents than soaps? Explain.
Which one is more effective for washing clothes soap or detergents give a reason for your answer?
- Ca2+ and Al3+
- N+ and Al3+
- Mg2+ and Ca2+
- Be2+ and Na3+
Is calcium oxide used for whitewashing or calcium hydroxide? Write in brief.
What is the common name for sodium carbonate?
Justify the statement the cleansing action of soap is due to emulsification and micelle formation.
What is the difference between caustic soda and caustic potash? Why are they called caustic?
What is the common name of the compound ?
Are all metal carbonates and metal hydrogencarbonates basic in nature? Explain
Why does hard water not produce foam with soap easily?
Why sulphur trioxide formed in absorption tower in contact process is not absorbed directly in water
What is Soap Chemistry?
Write some advantages and disadvantages of detergents.
Calcium and Magnesium salts
Sodium and Magnesium salts
Calcium and Sodium salts
Sodium salts
Name the salt used in photography. Write its chemical formula and color.
How does soap work in chemistry?
What is soap ? How would you make soap in the laboratory ? State one advantage and one disadvantage of soap over synthetic detergents.
Soap forms insoluble precipitates with the calcium and magnesium ions in hard water.
True
False
Reason (R): They do not form precipitates with Ca2+ and Mg2+ present in hard water.
- (A) is correct, (R) is wrong.
- (A) and (R) are correct, (R) doesn’t explain (A).
- (A) and (R) are correct, (R) explains the (A).
- (A) is wrong, (R) is correct.
Why are phospholipids good emulsifiers?
- Manufacturing of PVC
- Disinfectant for water
- Manufacturing of soaps and detergents
- Manufacturing of pesticides
Sodium metabisulphate is a chemical used to preserve ketchup.
- True
- False
Hard water contains salt of
carbon and magnesium
sodium and aluminium
calcium and magnesium
calcium and potassium
- True
- False
Name the substance which makes water (i) temporary hard and (ii) permanent hard.