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प्रश्न
Explain how anhydrous copper sulphate can be used to detect the presence of moisture (water) in a liquid.
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उत्तर
A few drops of the liquid to be tested are added to white anhydrous copper sulphate powder. The appearance of a blue colour in anhydrous copper sulphate indicates the presence of moisture or water in the liquid.
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संबंधित प्रश्न
Write a balanced equation for the preparation of the following salts:
Copper sulphate from copper carbonate.
Name three chemicals made from common salt (or sodium chloride).
Name the raw material used for the production of caustic soda.
Complete and balance the following chemical equation:
\[\ce{NaCl + NH3 + H2O + CO2 ->}\]
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation.
Name three products of the chlor-alkali process. State two uses of each of these products.
What is a salt?
The metal salt A is blue in colour. When salt A is heated strongly over a burner, then a substance B is eliminated and a white powder C is left behind. When a few drops of a liquid D are added to powder C, it becomes blue again. What could be A, B, C and D?
Consider the following salts:
Na2CO3, NaCl, NH4Cl, CH3COONa, K2SO4, (NH)2SO4
Which of these salts will give:
- acidic solutions?
- neutral solutions?
- basic solutions (or alkaline solutions)?
Name a salt whose solubility decreases with temperature.
Taking sodium carbonate as an example, give the meaning of the following terms:
Water of crystallization
Taking sodium carbonate as an example, give the meaning of the following terms:
Anhydrous
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 |
Distinguish by a chemical test sodium chloride and sodium sulphide.
Differentiate hydrate and anhydrous salts with examples.
Many salts absorb water from the atmosphere. This property is called:
Acids react with metallic oxides to produce ______.
How is normal salt obtained? Give a suitable reaction.
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:
Sodium zincate
