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प्रश्न
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 |
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उत्तर
| 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. |
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संबंधित प्रश्न
The salt prepared by the method of direct combination is _______.
Write the chemical name and formula of common salt.
What are the two main ways in which common salt (sodium chloride) occurs in nature?
Name three chemicals made from common salt (or sodium chloride).
Give any two uses of common salt (sodium chloride).
Common salt is obtained from sea-water by the process of ______.
Complete and balance the following chemical equation:
\[\ce{NaCl_{(aq)} + H2O_{(l)} ->[Electricity]}\]
Why is the electrolysis of a concentrated solution of sodium chloride known as chlor-alkali process?
Give the names and formulae of any two salts. Also name the acids and bases from which these salts may be obtained.
A salt whose aqueous solution will have a pH of more than 7 will be ______.
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 ______.
Give one example of a salt which gives an aqueous solution having:
pH equal to 7
The pH values of three solutions A, B and C are given in the table. Answer the folloiwng questions:
| Solution | pH value |
| A | 12 |
| B | 2 |
| C | 7 |
Which solution will liberate CO2 when reacted with sodium carbonate?
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
Name the anion present in the following compound:
Compound A, when warmed with concentrated sulphuric acid, gives a gas which fumes in moist air and which gives dense white fumes with ammonia.
Write any five uses of salts.
You are provided with the list of chemicals mentioned below in the box:
| Sodium hydroxide solution, copper carbonate, zinc, hydrochloric acid, copper, dilute sulphuric acid, chlorine, iron |
Using suitable chemicals from the list given, write a balanced chemical equation for the preparation of the salt mentioned below:
Copper sulphate
Select the correct answer from A, B, C, D and E.
A compound which in the aqueous solution state, is neutral in nature.
