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Question

The second step in the production of sulphuric acid is given by the equation:

2SO2(g) + O2(g) 2SO3(g)

Which conditions would increase the yield of this reaction?


A

High temperature, high pressure

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B

Low temperature, low pressure

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C
Low temperature, high pressure.
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D
High temperature, low pressure
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Solution

The correct option is C Low temperature, high pressure.

The given reaction is an exothermic reaction (heat is evolved). Raising the temperature too much can lead to the heat released in this exothermic reaction. The yield is decreased at high temperatures. Therefore, in this reaction lower temperatures and higher pressure favour the high yield of SO3(sulphur trioxide).


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