Question

what is the colour of substance produced by heating iron and sulphur
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Answer 1

Answer:

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).

Answer 2

Here's your answer mate

Yellow powder in which some iron filing is visible, i.e., heterogeneous. On heating A, B is obtained which is black in colour. No iron filings visible, i.e., homogeneous. Iron +Sulphur -> Ferrous sulphide.

Hope it will help you!!!!