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प्रश्न
How will the action of dilute hydrochloric acid enable you to distinguish between sodium thiosulphate and sodium sulphite?
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उत्तर
Sodium thiosulphate reacts with 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 dil. HCl.
\[\ce{Na2SO3 + 2HCl -> 2NaCl + H2O + SO2 ^}\]
संबंधित प्रश्न
Potassium sulfite on reacting with hydrochloric acid releases _______ gas. (Cl2, SO2, H2S)
Select from the list the gas that matches the description given in case
[ammonia, ethane, hydrogen chloride, hydrogen sulfide, ethyne]
This gas has a characteristic rotten egg smell.
State your observation When moist starch iodide paper is introduced into chlorine gas.
Dry hydrogen chloride gas can be collected by ______ displacement of air.
Give a chemical test to distinguish between the given pairs of chemicals:
Sodium chloride solution and Sodium nitrate solution
Name the following:
Salt obtained by heating sodium chloride with concentrated sulphuric acid below 200 degree celcius.
How will you distinguish between the two black samples, CuO and MnO2 with a chemical test?
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 |
Write observation:
Lead nitrate solution is mixed with dilute hydrochloric acid and heated.
State which of the two - a solution of HCl in water or in toluene is an electrolyte. Explain.
