3. (i) A mixture of iron dust and sulphur can be separated by a magnet.
(ii) On heating, a black powder is obtained which does not respond to a magnet.
Which of the following is the correct explanation for the observations given above?
(A) Iron loses its magnetic properties on heating.
(B) Iron vaporises due to strong heating.
(C) Iron combines with sulphur and loses its magnetic properties.
(D) Sulphur vaporises on heating which affects the properties of the mixture.
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Answer:
(D)
Explanation:
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