A student heats calculated amounts of iron filings and sulphur powder together in a boiling tube. He will obtain :(1) a homogeneous mixture of Fe and S(2) a heterogeneous compound of Fe and S(3) a homogeneous compound of FeS(4) a heterogeneous mixture of FeS, Fe and S
Correct answer: (3) a homogeneous compound of FeS
Explanation: When iron and sulphur are heated together in a boiling tube, they react together to form a grey-black compound of iron sulphide. The mixture formed will be homogeneous i.e. two elements mix together thoroughly and cannot be separated.
The reaction is given by:
$Fe + S → FeS$
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