when crystals of feso4 are strongly heated the residue obtained is
a) red in colour
b)blue in colour
c)green in colour
d)colourless
My tution teacher was sayin the answer is colourless but i think the answer is red as Fe2O3 is red in colour.
PLZ help am confused. and Explain.
The correct answer is red.
Ferrous sulphate is bluegreen in colour. On being heated, it loses water of crystallisation and is converted to anhydrous ferrous sulphate. The anhydrous ferrous sulphate on further heating decomposes to ferric oxide, sulphur dioxide and sulphur trioxide. Ferric oxide is reddish brown in colour. This is an example of decomposition reaction. Following is the equation for the reaction
2FeSO4 (s) heat >> Fe2O3 (s) + SO2(g) + SO3(g)
Ferrous sulphate is bluegreen in colour. On being heated, it loses water of crystallisation and is converted to anhydrous ferrous sulphate. The anhydrous ferrous sulphate on further heating decomposes to ferric oxide, sulphur dioxide and sulphur trioxide. Ferric oxide is reddish brown in colour. This is an example of decomposition reaction. Following is the equation for the reaction
2FeSO4 (s) heat >> Fe2O3 (s) + SO2(g) + SO3(g)
