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Does the number of moles of reaction pro...

Does the number of moles of reaction products increase, decrease, or remain same when each of the following equilibrium is subjected to a decrease in pressure by increasing the volume?
a. `PCl_(5)(g) hArr PCl_(3)(g)+Cl_(2)(g)`
b. `CaO(s)+CO_(2)(g) hArr CaCO_(3)(s)`
c. `3Fe(s)+4H_(2)O(g) hArr Fe_(3)O_(4)(s)+4H_(2)(g)`

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