Tincture of iodine has antiseptic properties. This solution is made by dissolving

$(a)$ Differentiate between a mixture and a compound.
$(b)$ You are provided with a mixture containing sand,iron filings,naphthalene,and sodium chloride. Describe the procedures you would use to separate these constituents from the mixture.

Classify the substances given in the figure into elements and compounds.

Classify each of the following as an element,compound,or mixture:
Gold,Air,Marble,Milk,Sugar.

$(a)$ Both smoke and fog are aerosols. In what way are they different?
$(b)$ How do sol and gel differ from each other? Give one example for each.

Which of the following are physical changes?
$(i)$ Melting of iron metal
$(ii)$ Rusting of iron
$(iii)$ Bending of an iron rod
$(iv)$ Drawing a wire of iron metal