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Oxides of Nitrogen

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Question

The crystals of ferrous sulphate on heating give ________.

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Solution

The reaction of ferrous sulphate upon heating:
The water of crystallisation is present in ferrous sulphate crystals $({FeSO}_{4} . 7 H_{2} O)$ .
Ferrous sulphate crystals lose water when heated.
$\underset{Hydrated Ferrous Sulpahte}{{FeSO}_{4} . 5 H_{2} O (l)} \overset{∆}{\to} \underset{Anhydrous Ferrous Sulpahte}{{FeSO}_{4} (l)} + \underset{Water}{5 H_{2} O (g) ↑}$
As a result of the creation of anhydrous ferrous sulphate $({FeSO}_{4})$ , their colour changes from light green to white.
When ferrous sulphate is further heated, ferric oxide, sulphur dioxide, and sulphur trioxide are produced.
The reaction proceeds as follows:
$\underset{Ferrous Sulphate}{2 {FeSO}_{4} (l)} \overset{∆}{\to} \underset{Ferric Oxide}{{Fe}_{2} O_{3} (l)} + \underset{Sulphur Dioxide}{{SO}_{2} (g) ↑} + \underset{Sulphur Trioxide}{{SO}_{3} (g) ↑}$
Thus, the crystals of ferrous sulphate on heating give ferric oxide, sulphur dioxide and sulphur trioxide.

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Q. (a) What is the colour of ferrous sulphate crystals? How does this colour change after heating?
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Q. You are given the following materials:
(i) Iron nails
(ii) Copper sulphate solution
(iii) Barium chloride solution
(iv) Copper powder
(v) Ferrous sulphate crystals
(vi) Quicklime

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