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Question

Which of the following reactions is associated with the most negative change in entropy?

A
2SO2(g)+O2(g)2SO3(g)
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B
C2H4(g)+H2(g)C2H6(g)
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C
C(s,graphite)+CO2(g)
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D
3C2H2(g)C6H6(l)
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Solution

The correct option is B 3C2H2(g)C6H6(l)
2SO2(g)+O2(g)2SO3(g)
3 moles of gas becomes 2 moles of gas
C2H4(g)+H2(g)C2H6(g)
2 moles of gas becomes 1 mole of gas
C(s,graphite)+O2(g)CO2(g)
1 mole of gas becomes 1 mole of gas
3C2H2(g)C6H6(l)
3 moles of gas becomes 1 mole of liquid
In (d) 3 moles of gas becomes 1 mole of liquid. If greater number of molecules transforms into a small number of molecules then entropy decreases. Also in (d) gas molecules changes to liquid, hence entropy decreases.
Hence (d) has the most negative change in entropy

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