When ferrous sulphate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in color and smell from:
Blue to green and smell of burning of sulphur
Green to blue and smell of burning of chlorine
Green to brown and pungent smell of burning of sulphur
Green to yellow and no odor no
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Explanation: When ferrous sulfate is heated strongly it undergoes decomposition to form ferric oxide as a main product accompanied by a change in color from green to yellow. The color of ferrous sulphate crystals are green and after heating, the color becomes white (pale yellow).
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