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Question

Which of the following gives SO3 on heating?

A
H2SO4+S
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B
Cu2SO4+C
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C
FeSO4
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D
H2SO4+PCl3
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Solution

The correct option is C FeSO4

When ferrous sulfate (FeSO4) is heated ,SO2,SO3,Fe2O3 are formed

The following reaction takes place

2FeSO4.7H2OFe2O3+SO2+SO3.

SO2,SO3 evolves as gases, the remaining residue is the solid - Fe2O3 (ferric oxide) - which is a reddish brown powder.
Hence option C is correct.

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