Question

pls solve only 1 or 2 questions. ive done the first one. pls help me out fast​

Answer 1

Hey !

4A) Rusting of iron is oxidation of iron from Fe to Fe2O3 and is an irreversible process. hence a chemical change. Whereas, iron bar gets magnetised only when it is in vicinity of a magnet and is a reversible process, hence it is a physical change.

4B)Freezing of water is a reversible change while burning of a candle an irreversible change. ... The burning of the candle is irreversible change as on reversing the conditions we cannot get candle back out of carbon dioxide, water vapors, and wax vapors.

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Answer 2

Answer:

burning of magnesium is a chemical change as when magnesium burn in presence of o2 it forms a white powder called magnesium oxide ,here the reactant is completely different from the product formed