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In the dissociation of CaCO₃ in a closed vessel, the forward reaction is favoured by

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adding some more CaCO₃

removing some CaO

increasing the pressure

removing CO₂

answer is D.

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Detailed Solution

$\large CaC{O_3}\left( s \right) \rightleftharpoons CaO\left( s \right) + C{O_2}\left( g \right)$

Addition (or) removal of CaCO₃, CaO has no influence on equilibrium state.

According to Le-Chatelier's principle

Addition of gaseous reactants (or) removal gaseous products favour forward reaction.

$\large \therefore$ Removal of CO₂ (g) favour forward reaction.

$\large \therefore$ Removal CO₂ (g) favours the decomposition of CaCO₃

Forward reaction involves increase in volume.

$\large \therefore$ favoured at low pressure.

$\large \therefore$ only option (4) is correct.

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