Advertisements
Advertisements
Question
Copy and complete the following table which refers to the action of heat on some carbonates:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | |
| Lead carbonate | |
| Copper carbonate |
Advertisements
Solution
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate | Yellow when hot, white on cooling |
| Lead carbonate | Yellow on cooling |
| Copper carbonate | Light green amorphous powder changes to black on cooling. |
APPEARS IN
RELATED QUESTIONS
State what would you observe when Washing Soda Crystals are exposed to the atmosphere
Write a balanced chemical equation for Action of dilute hydrochloric acid on magnesium sulphite.
Why is sodium chloride required in our body?
Name the salt which is used as preservative in pickles, and in curing meat and fish.
What is meant by 'hydrated' and 'anhydrous' salts? Explain with examples.
The aqueous solution of one of the following salts will turn red litmus to blue. This salt is:
(a) potassium sulphate
(b) sodium sulphate
(c) sodium chloride
(d) potassium carbonate
A salt is dissolved in water and the pH of this salt solution is measured with a universal indicator paper. If the pH of solution is less than 7, the salt is most likely to be:
(a) CH3COONa
(b) Na2CO3
(c) KCl
(d) NH4Cl
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
red litmus blue?
Give one example of a salt which gives an aqueous solution having:
pH less than 7
Give one example of a salt which gives an aqueous solution having:
pH more than 7
A salt X when dissolved in distilled water gives a clear solution which turns red litmus blue. Explain the phenomenon.
Name a salts whose solubility increases with temperature.
Name a salt whose solubility decreases with temperature.
name two salts which are basic.
Define the following term:
Water of crystallization
Taking sodium carbonate as an example, give the meaning of the following terms:
Water of crystallization
Salts A, B, C, D and E undergo reactions (i) to (v) respectively. Identify the anion present in these salts on the basis of these reactions.
- When silver nitrate solution is added to a solution of A, a white precipitate, insoluble in dilute nitric acid, is formed.
- The addition of dilute hydrochloric acid to B produces a gas which turns lead acetate black on paper.
- When a freshly prepared solution of ferrous sulphate is added to a solution of C and concentrated sulphuric acid is gently poured from the side of the test tube, a brown ring is formed.
- When dilute sulphuric acid is added to D, a gas is produced which turns acidified potassium dichromate solution from orange to green.
- The addition of dilute hydrochloric acid to E produces effervescence. The gas produced turns lime water milky but does not affect acidified potassium dichromate solution.
The chemical name of plaster of Paris is ______.
