For the contact process 2SO2 + O2 2SO3 (Delta H < 0), select the correct statement(s).

SO3 is absorbed in concentrated H2SO4 to give oleum

Equilibrium yield is favoured by lower temperature and higher pressure

SO3 is absorbed in concentrated H2SO4 to give oleum

Equilibrium yield is favoured by lower temperature and higher pressure

A pressure of about 100 atm is used industrially

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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3pn087

For the contact process $2 SO X_{2} + O X_{2} 2 SO X_{3}$ ( $Δ H < 0$ ), select the correct statement(s).

A $V X_{2} O X_{5}$ is used as the catalyst
B $SO X_{3}$ is absorbed in concentrated $H X_{2} SO X_{4}$ to give oleum
CEquilibrium yield is favoured by lower temperature and higher pressure
DA pressure of about 100 atm is used industrially

Answer: A, B, C

The reaction is exothermic with 3 mol of gas going to 2 mol, so Le Chatelier's principle favours low T and high P. In practice about 720 K and only about 2 bar are used with a

V X_{2} O X_{5}

catalyst, because the equilibrium already lies far to the right; D is false.

Practice p-Block Elements: Groups 15 and 16 More on Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

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For the contact process 2SOX2​+OX2​​2SOX3​ (ΔH<0), select the correct statement(s).

Answer: A, B, C

More questions on Sulphur allotropes, SO2, sulphuric acid, oxyacids of sulphur

For the contact process $2 SO X_{2} + O X_{2} 2 SO X_{3}$ ( $Δ H < 0$ ), select the correct statement(s).