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प्रश्न
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation.
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उत्तर
When copper sulphate crystals are heated strongly, they lose all the water of crystallisation and form anhydrous copper sulphate (which is white).
\[\ce{\underset{(Blue)}{\underset{Hydrated copper sulphate}{CuSO4*5H2O}} ->[Heat] \underset{(White)}{\underset{Anhydrous copper sulphate}{CuSO4}} + \underset{(Goes away)}{\underset{Water}{5H2O}}}\]
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संबंधित प्रश्न
From the list of the following salts choose the salt that most appropriately fits the
description is given in the following:
[AgCl, MgCl2, NaHSO4, PbCO3, ZnCO3, KNO3, Ca(NO3)2]
On heating this salt, a brown colored gas is evolved.
State whether the following statement is true or false:
Copper sulphate crystals are always wet due to the presence of water of crystallisation in them.
The aqueous solution of one of the following salts will turn phenolphthalein indicator pink. This salt is:
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Write the name and formula of one salt which contains:
Five molecules of water of crystallisation.
Name a salts whose solubility increases with temperature.
name two salts which are basic.
Name two salts which are neutral when dissolved in water.
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?
Give four substances which contain water of crystallization and write their common name.
Name a colourless gas which bleaches.
Distinguish by a chemical test sodium hydroxide solution and ammonium hydroxide solution.
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.
A salt that is formed by the complete neutralization of an acid and a base is called ______ salt.
What are hygroscopic substances?
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:
Copper sulphate
