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Contact process is used in the formation of sulphur trioxide, 2SO2(g)+O2(g)2SO3(g)
The rate of reaction can be expressed as ΔO2Δt=2.5×104mol L1s1
Then rate of disappearance of [SO2] will be 

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50.0×10−5mol L−1s−1
3.75×10−4mol L−1s−1
2.5×10−4mol L−1s−1
4.12×10−4mol L−1s−1

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detailed solution

Correct option is A

−ΔSO2Δt=2−ΔO2Δt∴ −ΔSO2Δt=2×2.5×10−4mol L−1s−1                          =5.0×10−4mol L−1s−1=50.0×10−5mol L−1s−1

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