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Question

Which of the following can be used to synthesize SO2 ?


A

FeS2+O2

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B

FeS+O2

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C

H2S+O2

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D

S+O2

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Solution

The correct options are
A

FeS2+O2


B

FeS+O2


C

H2S+O2


D

S+O2


Sulphide ores are strongly heated in the presence of air to convert them into their corresponding oxide forms.
You might recall that this process is called roasting.
4FeS2+11O22Fe2O3+8SO2
4FeS+7O22Fe2O3+4SO2

When hydrogen sulphide is burnt in air, sulphur dioxide and water are formed
2H2S+3O22H2O+2SO2

Sulphur dioxide can also be formed by burning sulphur in air:
S+O2SO2


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