The equilibrium, solid $⇌$ liquid $⇌$ gas, will shift in forward direction when :

temperature is raised

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temperature is constant

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temperature is lowered

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pressure is increased

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Solution

The correct option is A temperature is raised
According to Le Chatelier's principle adding heat to a solid and liquid in equilibrium with endothermic nature will cause the mass of solid to decrease.
Increase in temperature favours forward reaction. In endothermic reactions, heat is absorbed with the reactants.

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N_{2} (g) + 3 H_{2} (g) ⇌ 2 {N H}_{3} (g)

C a C O_{3} (s) \to C a O (s) + C O_{2} (g)

Δ_{f} H^{o} [C a O (s)] = - 635.1 {kJ mol}^{- 1}

Δ_{f} H^{o} [C O_{2} (g)] = - 393.5 {kJ mol}^{- 1}

Δ_{f} H^{o} [C a C O_{3} (s)] = - 1206.9 {kJ mol}^{- 1}

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