Types of Chemical Reactions

Q2. Photolysis is decomposition caused by heat.

Q3. Rusting of iron is a physical change only.

Q4. Oxidation is gain of electrons.

Q5. Every chemical reaction is reversible under all conditions.

Q6. A displacement reaction involves replacement of one element by another.

Q7. A compound breaking into two or more substances is a decomposition reaction.

Q8. Oxygen does not participate in combustion reactions.

Q9. Reduction may involve gain of electrons.

Q10. A decomposition reaction breaks one compound into simpler substances.