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Chemistry Question on Equilibrium

Which of the following is an example of homogeneous equilibrium?

A

\ce2SO2(g)+O2(g)<=>2SO3(g)\ce{2SO_{2(g)} +O_{2(g)} <=> 2SO_{3(g)}}

B

\ceC(s)+H2O(g)<=>CO(g)+H2(g)\ce{C_{(s)} + H2O_{(g)} <=> CO_{(g)} +H_{2(g)}}

C

\ceCaCO3(s)<=>CaO(s)+CO2(g)\ce{CaCO_{3(s)} <=> CaO_{(s)} + CO_{2(g)}}

D

\ceNH4HS(s)<=>NH3(g)+H2S(g)\ce{NH4HS_{(s)} <=> NH_{3(g)} + H2S_{(g)}}

Answer

\ce2SO2(g)+O2(g)<=>2SO3(g)\ce{2SO_{2(g)} +O_{2(g)} <=> 2SO_{3(g)}}

Explanation

Solution

A homogeneous equilibrium is where all the reactants and products are present in the same physical state i.e all the reactants and products are either in liquid or all of them are in the gaseous state. Here in option A, all the reactant and products are present in the same state.