Divide the class into two groups. Give 5 g of iron filings and 3 g of sulphur powder in a china dish to both the groups. Group I Mix and crush iron filings and sulphur powder. Group II Mix and crush iron filings and sulphur powder. Heat this mixture strongly till red hot. Remove from flame and let the mixture cool. Groups I and II Check for magnetism in the material obtained. Bring a magnet near the material and check if the material is attracted towards the magnet. Compare the texture and colour of the material obtained by the groups. Add carbon disulphide to one part of the material obtained. Stir well and filter. Add dilute sulphuric acid or dilute hydrochloric acid to the other part of the material obtained. Perform all the above steps with both the elements (iron and sulphur) separately. On adding dilute sulphuric acid or dilute hydrochloric acid, did both the groups obtain a gas? Did the gas in both the cases smell the same or different ?

Divide the class into two groups. Give 5 g of iron filings and 3 g of

1.	Divide the class into two groups. Give 5 g of iron filings and 3 g of sulphur powder in a china dish to both the groups. Group I Mix and crush iron filings and sulphur powder. Group II Mix and crush iron filings and sulphur powder. Heat this mixture strongly till red hot. Remove from flame and let the mixture cool. Groups I and II Check for magnetism in the material obtained. Bring a magnet near the material and check if the material is attracted towards the magnet. Compare the texture and colour of the material obtained by the groups. Add carbon disulphide to one part of the material obtained. Stir well and filter. Add dilute sulphuric acid or dilute hydrochloric acid to the other part of the material obtained. Perform all the above steps with both the elements (iron and sulphur) separately. On adding dilute sulphuric acid or dilute hydrochloric acid, did both the groups obtain a gas? Did the gas in both the cases smell the same or different ?
Answer» Solution :Both the groups OBTAINED a gas. The SMELL of gas in both the cases is different. The gas obtained in CASE of Group I is colourless and ODOURLESS. (This is hydrogen gas.) The gas obtained in case of Group II is colourless with smell of ROTTEN eggs. (This is hydrogen sulphide gas.)