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निम्नलिखित में से प्रत्येक साम्य में जब ...

निम्नलिखित में से प्रत्येक साम्य में जब आयतन बढ़ाकर दाब कम किया जाता है, तब बतलाइये की अभिक्रिया के उत्पादों के मोलों की संख्या बढ़ती है या घटती है या समान रहती है?
(a) `PCl_(5)(g) ltimplies PCl_(3)(g) + Cl_(2)(g)`
(b) `CaO(s) + CO_(2)(g) ltimplies CaCO_(3)(g)`
( c) `3Fe(s) +4H_(2)O(g) ltimplies Fe_(3)O_(4)(s) + 4H_(2)(g)`

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