Give a chemical tests to identify hydrogen sulphide and carbon dioxide.

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Solution

Test for hydrogen sulphide
The reaction with lead salts is the basis for the traditional test for hydrogen sulphide gas. Moist lead acetate (lead ethanoate) paper (see image, right) turns from white to silvery-grey or black when exposed to H₂S.
Test for carbon dioxide
The most effective way to test for CO₂ is to bubble the gas through "limewater", a diluted solution of calcium hydroxide (slaked lime). When you bubble carbon dioxide through the solution, it forms a solid precipitate of calcium carbonate – chalk or limestone.

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Similar questions

Give the chemical tests to distinguish between the following gases:

Hydrogen sulphide and carbon dioxide

The chemical which can be used to separate a mixture of carbon powder and sulphur powder successfully is :

(a) carbon dioxide (b) hydrochloric acid (c) hydrogen sulphide (d) carbon disulphide

Translate the following statements into chemical equations and then balance the equations :

(a) Hydrogen sulphide gas burns in air to give water and sulphur dioxide.

(b) Phosphorus burns in oxygen to give phosphorus pentoxide.

(d) Aluminium metal replaces iron from ferric oxide, $F e_{2} O_{3}$ , giving aluminium oxide and iron.

(e) Barium chloride reacts with zinc sulphate to give zine chloride and barium sulphate.

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