Iron filings and sulphur powder are mixed together and heated till this mixture become red
hot. After this about 2 mL of dilute H2SO4 is added to this and a gas is evolved. Which of the
following statements is true?
This gas evolved is H2 and it is non-combustible
The gas evolved is O2 and it is colourless
The gas evolved is H2S and it smells like rotten eggs
The gas evolved is SO2 and it is odourless
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the correct answer to this question is the first option
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