1.

In which one of the following equlibria, the increase of pressure over the equlibrium will favour the backward reaction

Answer»

Decomposition equlibrium of HI
Formation equlibrium of `SO_(3)`
Decomposition equlibrium of `NH_(3)`
Formation equlibrium of `PCl_(5)`

Solution :According to Le-Chatelier's principle, if a system at equlibrium is SUBJECTED toa change of concentration, pressure of temperatue, the equlibrium shifts in the directin that tends to undo the EFFECT of the change. When the pressure on the systyem is increased, the equlibrium will shift in the DIRECTON in which there is decrease in NUMBER of moles.
(a) `2HIhArrH_(2)+I_(2)`
(b) `SO_(2)+1//2O_(2)hArrSO_(3)`
(c) `2NH_(3)hArrN_(2)+3H_(2)`
(d) `PCl_(3)+Cl_(2)hArrPCl_(5)`
So, in reaction (c) the increase in pressure will favour backward reaction.


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