Q.

Molecular hydrogen is obtained from gaseous hydrogen atoms. Favourable conditions for the formation of hydrogen atoms from hydrogen molecule according to Leachatelier's principle are

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High temperature, low pressure

High temperature, high pressure

Low temperature, low pressure

Low temperature, high pressure

answer is A.

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Detailed Solution

2Hg⇋H2g ;Formation of molecule from atoms involves bond formation. The process is exothermic. It is favoured at low ‘T’.∆ng=1-2=-1;Formation of H2(g) molecule involves decreases in number of moles. It is favoured at high P.The reverse reaction is favoured at Low ‘P’ and High ‘T’.

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