Question

For dissociation of limestone in the slag zone of the blast furnace. The reaction is:

• A. exothermic accompanied by increase in entropy
• B. endothermic accompanied by decrease in entropy
• C. endothermic accompanied by increase in entropy
• D. exothermic with no change in entropy

Answer 1

The correct option is C endothermic accompanied by increase in entropy

For dissociation of limestone in the slag zone of the blast furnace, the reaction is endothermic accompanied by an increase in entropy.
$CaC{O}_{3_{\left(s\right)}}\to Ca{O}_{\left(s\right)}+C{O}_{2_{\left(g\right)}}\Delta H=+QKJ$
Heat is absorbed for the decomposition hence endothermic, entropy increases during the reaction as a gaseous product are obtained.