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Do the number of moles of reaction produ...

Do the number of moles of reaction products increase, decrease or remain or remain same when each of the following equilibria is subjected to a decrease in pressure by increasing the volume?
`CaO(s)+CO_2(g)iffCaCO_3(s)`

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Decrease of pressure wil favour backward direction because of the formation of more gaseous substance, i.e., number of moles of reaction products decrease.
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