Question

What is the colour of ferrous sulphate crystals? How does this colour change after heating? (ii) Name the products formed on strongly heating ferrous sulphate crystals. What type of chemical reaction occurs in this change?

September 11, 2024

Answer

(i) Colour Change of Ferrous Sulphate Crystals:

Ferrous sulphate (FeSO₄·7H₂O) crystals are pale green in color.
After heating, the green color disappears, and the residue turns brown due to the formation of ferric oxide (Fe₂O₃).

(ii) Products and Type of Reaction:

On strong heating, ferrous sulphate decomposes into:

Ferric oxide (Fe₂O₃) (Brown solid)
Sulfur dioxide (SO₂) (Pungent gas)
Sulfur trioxide (SO₃) (Pungent gas)

Balanced Chemical Equation:

Type of Reaction: Thermal Decomposition Reaction

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