1.

Why is mixing of iron and sulphor physcal change

Answer»

When iron filings and SULPHUR POWDER are mixed, both RETAIN their properties. It means they have not undergone any chemical reaction. THEREFORE, mixing of iron and sulphur is a physical CHANGE. When iron filings and sulphur powder are mixed and heated they undergo a chemical reaction and form ferrous sulphide ( FeS ).



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