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प्रश्न
Give any two uses of common salt (sodium chloride).
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उत्तर
- Common salt (sodium chloride) is used as a raw material for making a large number of useful chemicals in industry, such as sodium hydroxide (caustic soda), sodium carbonate (washing soda), sodium hydrogencarbonate (baking soda), hydrochloric acid, hydrogen, chlorine, and sodium metal.
- Common salt (sodium chloride) is used in cooking food. It improves the flavour of food. Sodium chloride is required by our body for the functioning of the nervous system, the movement of muscles, and the production of hydrochloric acid in the stomach for the digestion of food.
- Common salt (sodium chloride) is used as a preservative in pickles and in curing meat and fish (preserving meat and fish).
- Common salt (sodium chloride) is used in the manufacture of soap.
- Common salt (sodium chloride) is used to melt ice which collects on the roads during winter in cold countries.
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संबंधित प्रश्न
State what would you observe when Washing Soda Crystals are exposed to the atmosphere
Write the chemical name and formula of common salt.
How would you show that blue copper sulphate crystals contain water of crystallisation?
What happens when copper sulphate crystals are heated strongly? Explain with the help of an equation.
What happens when a few drops of water are added to anhydrous copper sulphate? 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 meant by ‘a family of salts’? Explain with examples.
A salt whose aqueous solution will have a pH of more than 7 will be ______.
Give one example of a salt which gives an aqueous solution having:
pH less than 7
Give one example of a salt which gives an aqueous solution having:
pH equal to 7
What is deliquescence? What name is given to the compounds exhibiting such property?
Give four substances which contain water of crystallization and write their common name.
State what would you observe when :
The salt ferric chloride is exposed to the atmosphere.
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 carbonate and sodium sulphite.
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.
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 | |
How many grams of Magnesium Sulphate are present in 135g of solid left by evaporation of sea water?
The acid reacts with a base to form a neutral product called ______.
