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PART - 1 CH - 6 Equilibrium — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryPART - 1 CH - 6 Equilibrium2 Marks
Question
Does the number of moles of reaction products increase, decrease or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?
(a) $PCl _5(g) \rightleftharpoons PCl _3(g)+ Cl _2(g)$
(b) CaO (s) $+ CO _2$ (g) $\rightleftharpoons CaCO _3$ (s)
(c) $3 Fe ( s )+4 H _2 O ( g ) \rightleftharpoons Fe _3 O _4(s)+4 H _2(g)$
✓

Answer

According to Le Chatelier's principle :
(a) On reducing pressure rate of forward reaction increases. Hence, number of moles of product increases.
(b) On reducing pressure, rate of backward reaction increases. Hence moles of product decreases.
(c) There will be no effect of pressure on this reaction as number of moles remains constant ( $\Delta n ( g )$ $=0$ ).

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