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Standard XII
Chemistry
Question

The most favourable conditions of temperature and pressure for the catalytic oxidation of SO2 into SO3 are:
  1. Medium temperature and high pressure
  2. Low temperature and low pressure
  3. High temperature and high pressure
  4. High temperature and low pressure

A
Medium temperature and high pressure
B
Low temperature and low pressure
C
High temperature and high pressure
D
High temperature and low pressure
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Solution
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This is the Contact process by adding an excess of oxygen to sulphur dioxide in the presence of the catalyst vanadium pentoxide, under temperatures of 450 °C and pressure of 1-2 atm.To increase the reaction rate, high temperatures (450 °C), medium pressures (1-2 atm), and vanadium(V) oxide (V2O5) are used to ensure a 96% conversion. The catalyst only serves to increase the rate of reaction as it does not change the position of the thermodynamic equilibrium.

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