Fe 0, (s) + SO,() + SO,(g) + 14H (3
1. On esting the pale green coloured crystals of ferrous sulphate undergo decom
Note the colour of the gas evolved on heating
Observe the colour of the substance in the cold test tube
and note it
action
Heat
2(FeSO, 7H,O) (5)
rence / Conclusion:
A mixture of ................ and ....
2. A residue of
colour remains in the test tube.
gases formed.
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Answer:
The color of ferrous sulphate crystals is green.
Ferrous sulphate crystals contain water molecules (FeSO4. 7H2O). On heating, ferrous sulphate crystals lose water and anhydrous ferrous sulphate (FeSO4) is formed. So their colour changes from light green to white.
On further heating, anhydrous ferrous sulphate decomposes to form ferric oxide (Fe2O3), sulphur dioxide (SO2) and sulphur trioxide (SO3). So, the gas emitted smells like burning sulphur.
In this reaction, the single reactant FeSO4 decomposes to form three different products. So, the reaction is a decomposition reaction.
2FeSO4(s)→Fe2O3(s)+SO2(g)+SO3(g)
Ahydrous ferrous Ferric oxide
Sulphate (white) (brown)
Explanation:
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