Question

Which among the following is released when potassium chlorate is heated in the laboratory?

• A. Potassium permanganate
• B. Potassium chloride
• C. Oxygen
• D. Hydrogen

Answer 1

Answer: (B), (C)

The correct options are
B Potassium chloride
C Oxygen

Potassium chlorate is used in the laboratory preparation of oxygen. When potassium chlorate is heated in the presence of a catalyst (manganese dioxide) then it undergoes decomposition to form potassium chloride and oxygen gas. The reaction occurs as follows:

$2{\text{KClO}}_3\underset{\text{Heating at 400 K}}{\overset{\text{Manganese Dioxide}}{\to }}\text{2KCl}+{\text{3O}}_2$