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प्रश्न
Name three chemicals made from common salt (or sodium chloride).
उत्तर
hemicals made from common salt:
- Sodium hydroxide (NaOH), or caustic soda
- Washing soda (Na2CO3.10H2O), or sodium carbonate decahydrate
- Baking soda (NaHCO3), or sodium hydrogen carbonate
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संबंधित प्रश्न
Name the salt which is used as preservative in pickles, and in curing meat and fish.
Explain why chlorine is used for sterilising drinking water supply.
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(a) NaCl, Cl2 and H2
(b) H2, Cl2 and NaOH
(c) Cl2, Na2CO3 and H2O
(d) NaOH, Cl2 and HCl
P and Q are aqueous solutions of sodium chloride and sodium hydroxide, respectively. Which of these will turn:
red litmus blue?
Name the particles present in :
Strong electrolyte
Define the following term : Water of crystallization
Outline the steps required to convert hydrogen chloride to anhydrous iron (III) chloride. Write the equations for the reactions.
Copy and complete the following table which refers to the action of heat on the carbonate:
| Carbonate | Colour of residue on cooling |
| Zinc Carbonate |
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 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.
What are hygroscopic substances?
