Salts
Salts: Overview
This Topic covers sub-topics such as Baking Soda, Salts, Gypsum, Plaster of Paris, Bleaching Powder, Uses of Bleaching Powder, Washing Soda, Uses of Plaster of Paris, Uses of Baking Soda, Uses of Washing Soda, Common Salt and, pH of Salts
Important Questions on Salts
A salt contains calcium and a negative radical containing nitrogen. If three molecules of the salt contain atoms of oxygen. Identify the acid and base from which it is produced.
Diana prepared a cake by two methods.
Method i) She added baking soda to the cake mixture and let the mixture stand for one hour before placing it in the oven to bake.
Method ii) She added baking powder to the cake mixture and let the mixture stand for one hour before placing it in the oven to bake.
State the difference in the cake mixtures that Diana is likely to have observed before baking. Explain why.
Why is bleaching powder used for in the purification of water?
Which chemical is used in the manufacture of soap as well as used as a preservative in pickles?
A white powder A is a mild non-corrosive base and used in the preparation of cakes. When the powder is heated it gives another powder B. The powder B recrystallised to get a substance C which has detergent properties. Identify A, B and C and also write balanced chemical equations for the conversions of A to B.
Write the decomposition reaction of Sodium bicarbonate.
Salt belongs to which state of matter and why?
Name a salt that regain its colour when we rehydrated.
Match the chemical substances given in Column (A) with their appropriate application given in Column (B).
| Column(A) | Column (B) | ||
| (a) | Bleaching powder | (i) | Preparation of glass |
| (b) | Baking soda | (ii) | Production of and |
| (c) | Washing soda | (iii) | Decolourisation |
| (d) | Sodium chloride | (iv) | Antacid |
The following questions consist of two statements- Assertion and Reason. Answer these questions selecting the appropriate option given below:
Assertion: Plaster of Paris is stored in a moisture-proof container.
Reason: Plaster of Paris sets into a hard mass on wetting with water to form anhydrous calcium sulphate.
Identify the efflorescent substance from the following:
Efflorescence is a process in which crystalline salt loses its shape and turns powdery. What is true in this context:
Compound used for preparation of Baking powder is
Which of the following is used to purify drinking water?
When crystals of copper sulphate are strongly heated, the residue obtained is
Washing soda is used to increase the hardness of the water.
Washing soda is used in the preparation of _____.
