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प्रश्न
A solution of hydrogen chloride in water is prepared. The following substances are added to separate portions of the solution:
| S. No. | Substances added | Gas evolved | Odour |
| 1. | Calcium carbonate | _________ | _________ |
| 2. | Magnesium ribbon | _________ | _________ |
| 3. | Manganese (IV) oxide with heating | _________ | _________ |
| 4. | Sodium sulphide | _________ | _________ |
Complete the table by writing the gas evolved in each case and its odour.
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उत्तर
| S. No. | Substances added | Gas evolved | Odour |
| 1. | Calcium carbonate | CO2 | Odourless |
| 2. | Magnesium ribbon | H2 | Odourless |
| 3. | Manganese (IV) oxide with heating | Cl2 | Strong Pungent odour |
| 4. | Sodium sulphide | H2S | Rotten egg |
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State the use of aqua-regia.
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Match the following:
| Column A | Column B |
| 1. A substance that turns moist starch iodide paper blue. | A. Ammonium sulphate |
| 2. A compound which release a reddish brown gas on reaction with concentrated sulphuric acid and copper turnings. | B. Lead carbonate |
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| 4. A compound which on heating with sodium hydroxide produces a gas which forms dense white fumes with hydrogen chloride. | D. Copper nitrate |
| 5. A white solid which gives a yellow residue on heating | E. Ferrous sulphate |
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