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What happens when ferrous sulphate crystals are heated?
(a) A gas having the smell of burning sulphur is evolved
(b) No gas is evolved
(c) Brown coloured gas is evolved
(d) Colourless and odourless gas is evolved.
Correct Answer: (a) A gas having the smell of burning sulphur is evolved
Explanation: The green colour of ferrous sulphate crystals changes to brownish-black ferric oxide and smell of burning sulphur is evolved due to SO2 and SO3.
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