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Decomposition Reaction

Heating of fe...

Question

Heating of ferrous sulphate crystals results in change in the colour of the crystals. This reaction is an example of:

A

Decomposition reaction

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B

Combination reaction

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C

Displacement reaction

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D

Cannot be predicted

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Solution

The correct option is A Decomposition reaction
Ferrous sulphate crystals are green in colour. When they are heated, they lose the water of crystallisation and their colour changes to white. On further heating, ferric oxide is formed along with sulphur dioxide and sulphur trioxide. The colour of the product is very different from the initial crystals. Since in this reaction a single reactant breaks down into simpler products, it is a decomposition reaction.

$2 F e S O_{4} H e a t - -- \to F e_{2} O_{3} + S O_{2} + S O_{3}$

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