2017 · Q13
Which one of the following is a physical change?
General KnowledgeChemistry
- ABurning of coal
- BBurning of wood
- CHeating of a platinum crucible
- DHeating of potassium chlorate
Explanation
Heating a platinum crucible produces no new substance — a physical change. Burning coal or wood and heating potassium chlorate (which decomposes into KCl and O₂) are chemical changes. Hence C.