On heating ferrous sulfate crystals, one would get:

sweet smell
rotten egg smell
the smell of burning sulfur
no solid residue

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Solution

The correct option is B
rotten egg smell

Decomposition reactions:
When a single reactant decomposed into two or more products due to light or heat then the reactions are known as decomposition reactions.
Ferrous sulfate $({FeSO}_{4})$ contains crystals of water. On heating ferrous sulfate, water is lost and it smells like rotten egg.
Hence, option b is the correct answer.
The rest of the options are incorrect.

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On heating ferrous sulfate crystals, one would get:sweet smellrotten egg smellthe smell of burning sulfurno solid residue

On heating ferrous sulfate crystals, one would get:

sweet smell
rotten egg smell
the smell of burning sulfur
no solid residue