Question

For the 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 flux used is in entropy
• C. endothermic accompanied by increase in entropy.
• D. exothermic with no change in entropy

Answer 1

Answer: (C)

endothermic accompanied by increase in entropy.

Answer 2

Dissociation of limestone in the slag zone of the blast furnace is represented as
${ CaCO_{3(s)} ->[\Delta] CaO_{(s)} + CO_{2(g)} }$
The reaction proceeds with absorption of heat and leads to increase in entropy due to formation of ${CO_2}$ gas.