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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn163

Select the correct statement(s) about the contact process.

  1. AVanadium(V) oxide is used as the catalyst.
  2. BThe forward reaction is exothermic, so higher temperature lowers the equilibrium conversion.
  3. CSulphur trioxide is absorbed in concentrated sulphuric acid to give oleum.
  4. DLower temperature gives a faster rate, so the plant is run at the lowest possible temperature.

Answer: A, B, C

V2O5 catalyses (), so Le Chatelier's principle predicts lower yield at higher temperature. SO3 goes into 98% H2SO4 to form oleum. Rates fall, not rise, at lower temperature, so the last statement is false.
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