The correct option is (a) 1 only.
Explanation
The question distinguishes between the properties of a mixture of elements (Iron and Sulphur) and the compound formed by their chemical reaction (Iron(II) sulphide). It further tests the chemical properties of the resulting compound when reacted with dilute acids.
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Statement 1 is Correct:
When a mixture of Iron filings (Fe) and Sulphur powder (S) is heated strongly, a chemical combination reaction occurs to form Iron(II) sulphide (FeS). While pure Iron is magnetic, the compound FeS loses the individual properties of its constituent elements and is non-magnetic. -
Statement 2 is Incorrect:
When the compound Iron(II) sulphide (FeS) reacts with dilute acid (such as hydrochloric acid or sulphuric acid), it produces Hydrogen sulphide (H2S) gas. This gas is characterized by the distinct smell of rotten eggs. The smell of burning sulphur is characteristic of Sulphur dioxide (SO2), which is not evolved in this reaction.
Key Takeaway:
A compound exhibits properties different from its constituent elements. Iron is magnetic, but Iron sulphide is not. Reaction of metal sulphides with dilute acids evolves Hydrogen sulphide gas (rotten egg smell), whereas burning sulphur produces Sulphur dioxide.