SSC
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Silvery grey iron filings (density = 7.87 g/cm3) are added to yellow sulfur powder (density = 1.96 g/cm3) in a test tube. The contents of the test tube were strongly heated until they glowed red without further heating to form a dark grey dull solid (density = 4.84 g/cm3), which cannot be separated by physical means. Which of the following best describes the dark grey, dull solid?
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An element
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A compound
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A heterogeneous mixture
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A homogeneous mixture
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Explanation:
Detailed explanation-1: -On heating sulphur powder and iron fillings, a chemical reaction takes place resulting in the formation of hydrogen sulphide gas, which is colourless and has a smell of rotten eggs.
Detailed explanation-2: -When we heat sulphur and iron filings together, they form iron sulphide. It is usually black in colour. Therefore, the observation made is that the colour of the compound formed will be black and it is iron sulphide.
Detailed explanation-3: -When iron filings and sulphur powder are mixed and heated, this would result in a chemical reaction leading to the formation of black ferrous sulphide.
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