The correct procedure of heating iron-sulphur mixture to prepare iron sulphide is :(1) heat the powder mixture at the base of the test tube using a blue flame throughout.(2) heat the iron filings and sulphur mixture in the middle of the test tube using yellow flame throughout.(3) heat the powder mixture at the top of the test tube using an orange flame throughout.(4) heat the iron fillings-sulphur mixture at 3/4 quarters of the test tube using a red flame throughout.
Correct Answer: (1) heat the powder mixture at the base of the test tube using a blue flame throughout.
Explanation: Fe and S mixture is prepared by heating them in the test tube under blue flames, they are heated until the grey-black coloured iron sulphide is obtained.
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