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Question
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 | _________ | _________ |
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Solution
| S. No. | Substances added | Gas evolved | Odour |
| 1. | Calcium carbonate | \[\ce{CO2}\] | Odourless |
| 2. | Magnesium ribbon | \[\ce{H2}\] | Odourless |
| 3. | Manganese (IV) oxide with heating | \[\ce{Cl2}\] | Strong Pungent odour |
| 4. | Sodium sulphide | \[\ce{H2S}\] | Unpleasant like |
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