Question

Select the odd one out:
1. burning of coal. burning of magnesium, melting of wax
2. galvanisation, crystallisation, alloying
3. combustion, rusting, physical change
4. cutting of nails, breaking of glass, formation of iron sulphide​

Answer 1

1) melting of wax

2) crystallization

3) physical change

4) formation of FeS

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