Question

A student is given a mixture of iron filings and sulphur in thee ratio 1:2 by weight. He was then asked to heat the mixture over a flame and to observe the olor change. The student will observe that the mixture becomes

Answer 1

Answer:

Black is the answer

Answer 2

The student will observe that the mixture becomes black.

• When iron filings are mixed with sulphur in a 1:2 ratio and heated the mixture over flame they react to form ferrous sulfide.
• The reaction is -
• $Fe+S_2\rightarrow FeS_2$
• In this reaction, one mole of iron reacts with two moles of Sulfur to form one mole of ferrous sulfide.
• This ferrous sulphide is black. That's why the mixture becomes black.