Dilute hydrochloric acid is added in turn to a mixture of iron and sulphur and to the compound formed between iron and sulphur. Name the gas formed in each case.

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Solution

On heating iron and sulphur to a sufficiently high temperature, iron sulphide is formed.

Fe(s) + S(s) → FeS(s)

When HCl is added to mixture of iron and sulphur, iron reacts with HCl to form iron (II) chloride with the evolution of hydrogen gas.

Fe(s) + 2HCl(aq) → FeCl₂ + H₂

When HCl is added to iron sulphide, iron (II) chloride is formed and hydrogen sulphide gas is liberated in the process.

FeS(s) + 2HCl(aq) → FeCl₂(aq) + H₂S(g)
Iron (II)
chloride

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Question 33
Write a balanced chemical equation for each of the following reactions and also classify them.

(a) Lead acetate solution is treated with dilute hydrochloric acid to form lead chloride and acetic acid solution.

(b) A piece of sodium metal is added to absolute ethanol to form sodium ethoxide and hydrogen gas.

Balance the following reaction:

1.when ammonium hydroxide is added to a solvent of iron (II) Sulphate , a green ppt of iron (II) hydroxide and ammonium sulphate is formed.

2.Zinc reacts with dilute hydrochloric acid to form zinc chloride and hydrogen gas liberated.

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