In the reaction of formation of sulphur trioxide by contact process; 2SO2+O2⇌2SO3, the rate of reaction was measured as d[O2]dt=−2.5×10−4molL−1s−1. The rate of disappearance of [SO2] in mol.L−1s−1 will be:
A
−3.75×10−4
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B
−1.25×10−4
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C
−2.50×10−4
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D
−5.00×10−4
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