Q.

According to law of mass action, for  CaCO3⇌CaO + CO2  (Rf = Rate of forward and Rb = Rate of backward reactions)

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a

b

c

d

answer is A.

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Detailed Solution

At equilibrium applying law of mass action to backward reaction.rb = kb [CO2]Note: CaCO, CaO are solids. Their concentration changes are negligible  and law of mass aciton cannot be applied.
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According to law of mass action, for  CaCO3⇌CaO + CO2  (Rf = Rate of forward and Rb = Rate of backward reactions)