Question

2g of ferrous sulfate crystals were heated in a hard glass test tube and observations recorded

i) what was successive colour change ?

ii) identify the liquid droplets collected on the cooler parts of the testtube

iii) what type of odour is observed on heating ferrous sulphate crystals ?

iv) name the product obtained on heating ferrous sulphate crystal

v) what type of reaction is taking place

Answer 1

1. Green colour of ferrous sulfate changes to brown colour of Fe203.

2. H2O is the liquid found on the cooler parts of the test tube as the water of crystallization of FeSo2.7H20 gets deposited on the cooler parts of the test tube

3. It mells like burning sulphur

4. SO2 & SO4 & Fe2O3

5. Decomposition reaction

6. FeSO4 --> Fe2O3 + SO2 + SO3

Answer 2

i) green color changes to brown

ii) water

iii) as of burning sulphur

iv)Ferric oxide, sulphur di-oxide, sulphur-trioxide

v) thermal decomposition reaction