Can someone please help me solve this question

Question

By observing the decomposition reaction, as the unknown mixture was being heated a liquid was formed, towards the end of the heating, the liquid was no longer present only a solid is observed. Based on the physical properties of KClO3 and KCl, what was the liquid and what happened to it?

Answer 1

Assuming the original sample was a mixture of KCl and KClO₃, the liquid observed upon heating would have been liquid KClO₃ which has a lower melting point than KCl. With continued heating, the liquid KClO₃ would decompose to KCl and O₂ gas and so the liquid would disappear turning into solid KCl and the oxygen gas would go into the atmosphere.