Multiple choice

Which one of the following reactions is favourable at low pressure?

  1. H2 + I2 ⇌ 2HI

  2. PCl5 ⇌ PCl3 + Cl2

  3. N2 + 2H2 ⇌ 2NH3

  4. N2 + O2 ⇌ 2NO
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B Correct answer
Explanation

  We know that low pressure favours the reaction accompanied with increase in number of moles and in the given option, the number of moles of reactants are less than number of moles of product or we can say there is an increase in number of moles in product side, so this reaction will be favoured at low pressure.

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