Question

Q14. Answer question numbers 14.1 to 14.4 based on your understanding of the following paragraph and the
related studied concepts.
Karan and his friends visit the chemical laboratory in their school to know the difference between elements and
compounds. They asked the lab assistant about the same but the assistant did not respond to them directly but
instead told them to do an experiment. The lab assistant divided them in two groups, A and B. Both the groups were
told to take 5 g of iron filings and 3 g of Sulphur powder in a china dish. Group A has to mix and crush the iron
filings and sulphur. Group B has to do the same and then heat the china dish till the mixture becomes red hot and
then remove from flame and let it cool. To one part of both the mixtures, they added carbon disulphide and stirred
well and filtered. To another part, they added dilute sulphuric acid.
14.1 What gas is obtained by Group A?
142 What gas is obtained by Group B and how is it identified ?
14.3 What is the difference between material obtained by Group A and Group B ?
14.4 Give one property of mixtures.​

Answer 1

14.1) hydrogen
14.2) gas obtained is hydrogen sulphide. It is colorless with the smell of rotten egg
14.3) gas obtained by group A is hydrogen. It is colorless, odourless and combustible.
gas obtained is hydrogen sulphide. It is colorless with the smell of rotten egg
14.4) elements of mixture just mix together to form a mixture and no new compound is formed



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