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प्रश्न
State one relevant observation for the following:
Anhydrous calcium chloride is exposed to air for some time.
उत्तर
Anhydrous CaCl2 on exposure to atmosphere form solution.
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संबंधित प्रश्न
The salt prepared by the method of direct combination is _______.
What is a salt?
Give the names and formulae of any two salts. Also name the acids and bases from which these salt may be obtained.
Give one example of a salt which gives an aqueous solution having:
pH more than 7
Write the name and formula of one salt each which contains:
two molecules of water of crystallisation
State one observation for each of the following :
Lead nitric is heated strongly in a test tube.
Define the following term: Efflorescence.
State what would you observe when :
Washing soda crystals are exposed to the atmosphere.
The Salt Story
From: The New Indian Express 9 March 2021
The salt pans in Marakkanam, a port town about 120 km from Chennai are the third largest producer of salt in Tamil Nadu. Separation of salt from water is a laborious process and the salt obtained is used as raw materials for manufacture of various sodium compounds.
One such compound is Sodium hydrogen carbonate, used in baking, as an antacid and in soda acid fire extinguishers.
The table shows the mass of various compounds obtained when 1litre of sea water is evaporated.
| COMPOUND | FORMULA | MASS OF SOLID PRESENT /g |
| Sodium Chloride | NaCl | 28.0 |
| Magnesium Chloride | MgCl2 | 8.0 |
| Magnesium Sulphate | MgSO4 | 6.0 |
| Calcium Sulphate | CaSO4 | 2.0 |
| Calcium Carbonate | CaCO3 | 1.0 |
| TOTAL AMOUNT OF SALT OBTAINED | 45.0 | |
What is the pH of the acid which is used in the formation of common salt?
Select the correct answer from A, B, C, D and E.
A compound which in the aqueous solution state, is neutral in nature.
