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=2.5×10−4mol L−1s−1Then 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

answer is A.

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Detailed Solution

−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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