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In multistage equilibrium conversion of SO2 to SO3 (2SO2 + O2 2SO3), the reverse reaction becomes appreciable at a temperature of 550° C. The percentage equilibrium conversion of SO2 to SO3 can be increased by

A. Increasing the oxygen concentration

B. Putting more quantity of V2O5 catalyst in the converter

C. Removing some quantity of SO3 during intermediate stage

D. Maintaining low temperature & pressure in the converter

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