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प्रश्न
Fill in the blank
___________ is the phenomenon by which hydrated salts on exposure to dry air, lose their water of crystallization and crumble to powder.
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उत्तर
Efflorescence is the phenomenon by which hydrated salts on exposure to dry air lose their water of crystallisation and crumble to powder.
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संबंधित प्रश्न
The salt prepared by the method of direct combination is _______.
Write a balanced equation for the preparation of the following salts:
Copper sulphate from Copper Carbonate.
Write the chemical name and formula of common salt.
Complete and balance the following chemical equations:
`NaCl + NH_3 + H_2O +CO_2`→
Give the names and formulae of any two salts. Also name the acids and bases from which these salt may be obtained.
Write the name and formula of one salt each which contains:
five molecules of water of crystallisation
You are asked to prepare hard water in your laboratory. Select a group from the following groups of salts, any salt of which you may dissolve in distilled water to obtain hard water.
(A) NaCl; Na2SO4; KCl
(B) NaCl; CaCl2; KCl
(C) CaCl2; CaSO4; MgSO4
(D) Na2SO4; CaSO4; MgSO4
Hard water required for an experiment is not available in a school laboratory. However, following salts are available in the laboratory. Select the salts which may be dissolved in water to make it hard for the experiment.
|
(1) |
Calcium Sulphate |
(2) |
Sodium Sulphate |
|
(3) |
Calcium Chloride |
(4) |
Potassium Sulphate |
|
(5) |
Sodium Hydrogen Carbonate |
(6) |
Magnesium Chloride |
(A) 1, 2 and 4
(B) 1, 3 and 6
(C) 3, 5 and 6
(D) 2, 4 and 5
Define the following term:
Water of crystallization
How is normal salt obtained? Give a suitable reaction.
