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प्रश्न
How will the action of dilute hydrochloric acid enable you to distinguish between sodium thiosulphate and sodium sulphite?
उत्तर
Sodium thiosulphate reacts with \[\ce{dil. HCl}\] to produce sulphur dioxide gas and precipitates yellow sulphur.
\[\ce{Na2S2O3 + 2HCl → 2NaCl + H2O + SO2 + S↓}\]
Sulphur is not precipitated when sulphites are treated with \[\ce{dil. HCl}\].
\[\ce{Na2SO3 + 2HCl -> 2NaCl + H2O + SO2 ^}\]
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संबंधित प्रश्न
State one relevant observation for given reactions:
Action of dilute Hydrochloric acid on iron (II) sulfide.
Convert two soluble metallic nitrates to insoluble metallic chlorides using \[\ce{dil. HCl}\].
Name the following:
Drying agent used to dry hydrogen chloride.
Name the following:
A metallic oxide which reacts with hydrochloric acid to give a coloured solution.
State the use of aqua-regia.
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.
How will you identify?
An amphoteric hydroxide
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 |
| 3. A solution of this compound gives dirty green precipitate with sodium hydroxide. | C. Chlorine |
| 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 |
State which of the two - a solution of HCl in water or in toluene is an electrolyte. Explain.
State which of the two - a solution of HCl in water or in toluene is an electrolyte. Explain.
