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.(Note: teacher supervision is necessary for this activity). • Perform all the above steps with both the elements (iron and sulphur) separately Did the material obtained by the two groups look the same? • Which group has obtained a material with magnetic properties? • Can we separate the components of the material obtained? • 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?
Answers
Answer:
Correct option is
A
Group X
On heating the mixture in Y the magnetic property of Y is lost as it gets decomposed. So the magnetic property is shown by iron fillings in X group.
Answer:
1• Did the material obtained by the two groups look the same?
2• Which group has obtained a material with magnetic properties?
3• Can we separate the components of the material obtained?
4• 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?
Explanation:
ans 1. yes
ans 2.group-I has magnetic properties
ans 3.we can seperate the components of the materials obtained only in the case of Group - I
ans 4.yes ,the gas obtained by group - I is hydrogen,it is colorless,odourless and combustible ; the gas obtained by group - II is hydrogen sulphide,it is colorless with the smell of rotten eggs.