Iron filings and sulphur powder were mixed together and divided into
two parts, A and B. Part A was heated strongly while part B was not
heated. Which gas will be evolved when dilute hydrochloric acid is
added to part A?
A. Hydrogen sulphide
B. Hydrogen
C. Sulphur dioxide
D. Sulphur trioxide
Answers
Answer:
here
Explanation:
When iron filings and sulphur powder are mixed and heated, they undergo a chemical reaction and form ferrous sulphide (FeS). It is a new substance that has properties entirely different from Fe and S.
The equation for the reaction that produces the iron sulphide is:
Fe + S → FeS
This reaction is called the Combination reaction.
When HCl is added to this mixture ferric chloride is produced and Hydrogen Sulphide gas is produced. The foul rotten egg smell of Hydrogen sulphide is the indicator of H2S production.
Part B:
When dilute HCl is added to setup B Hydrogen gas is evolved and sulphur does not take part in the reaction. When a burning match stick is brought near the evolved gas, the matchstick burns with a pop. This is the indication of the production of Hydrogen gas.