Question

V. Find the odd one out. Give scientific reasons for your answer.
1. Melting of wax, drying of wet clothes, grinding of substance, burning of candle
2. Close contact, solution form, light, air
3. Combination, decomposition, catalyst, displacement
4. Permanent, irreversible, temporary, heat absorbed.​

Answer 1

Explanation:

1. grinding of substance. All other substances are reversible change while this one is an irreversible change

3. catalyst. All others are types of reaction while a catalyst is used in a reaction to speed up the reaction without any change to it.

4. heat absorbed. All others are types of changes while it is not.

or it can also be

temporary. as all others are something that do not change and remain stable as they are bt this one doesnt