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(A) pure substance consists of particles of only one type of chemical nature. Its composition remains the same throughout.$(a)$ Ice is solid water $(H

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$(a), (c), (e), (f)$

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(A) pure substance consists of particles of only one type of chemical nature. Its composition remains the same throughout.$(a)$ Ice is solid water $(H_2O)$,which is a pure compound.$(b)$ Milk is a mixture (colloid) of water,fats,and proteins.$(c)$ Iron $(Fe)$ is an element,which is a pure substance.$(d)$ Hydrochloric acid is typically an aqueous solution of hydrogen chloride gas $(HCl)$ in water,making it a mixture.$(e)$ Calcium oxide $(CaO)$ is a pure compound.$(f)$ Mercury $(Hg)$ is an element,which is a pure substance.$(g)$ Brick is a mixture of various minerals and soil components.$(h)$ Wood is a complex mixture of cellulose,lignin,and other organic compounds.$(i)$ Air is a mixture of various gases like nitrogen,oxygen,argon,and carbon dioxide.Therefore,the pure substances are $(a), (c), (e),$ and $(f)$.

Which of the following materials fall in the category of a 'pure substance'?
$(a)$ Ice $(b)$ Milk $(c)$ Iron $(d)$ Hydrochloric acid $(e)$ Calcium oxide
$(f)$ Mercury $(g)$ Brick $(h)$ Wood $(i)$ Air.

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Which of the following materials fall in the category of a 'pure substance'?$(a)$ Ice $(b)$ Milk $(c)$ Iron $(d)$ Hydrochloric acid $(e)$ Calcium oxide$(f)$ Mercury $(g)$ Brick $(h)$ Wood $(i)$ Air.