Question

which is not evolved on heating ferrous sulphate crystals

Answer 1

Hey!


Ferrous sulphate is basically a hydrated salt. The most commonly available form of hydrated ferrous sulphate contains seven molecules of water of crystallisation and therefore it is represented by the chemical formula FeSO4.7H2O. This salt is blue-green in colour. On heating it loses the seven molecules of water of crystallisation and forms anhydrous ferrous sulphate, which is greenish white in colour. When anhydrous ferrous sulphate is further heated, it decomposes to give sulphur dioxide, sulphur trioxide and ferric oxide (Fe2O3), which is reddish brown in colour. The gases have pungent odour. This is an example of decomposition reaction. Following is the equation for the reaction

FeSO4.7H2O (on heating) = FeSO4 + 7H2O (white colour)

2FeSO4 (on heating) = Fe2O3 + SO2 + SO3

Hope it helped!

Answer 2

it burn and fromed sulphur smell is come