What is meant by a pure substance?
- A$A$ substance containing only one type of atom or molecule.
- B$A$ substance containing a mixture of different elements.
- C$A$ substance that can be separated by physical methods.
- D$A$ substance that has variable composition.
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Similar Questions
Which of the following are not compounds?
$(a)$ Chlorine gas
$(b)$ Potassium chloride
$(c)$ Iron
$(d)$ Iron sulphide
$(e)$ Aluminium
$(f)$ Iodine
$(g)$ Carbon
$(h)$ Carbon monoxide
$(i)$ Sulphur powder
$(a)$ Chlorine gas
$(b)$ Potassium chloride
$(c)$ Iron
$(d)$ Iron sulphide
$(e)$ Aluminium
$(f)$ Iodine
$(g)$ Carbon
$(h)$ Carbon monoxide
$(i)$ Sulphur powder
Medium
View SolutionWhich 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
$(i)$ Melting of iron metal
$(ii)$ Rusting of iron
$(iii)$ Bending of an iron rod
$(iv)$ Drawing a wire of iron metal
Medium
View Solution$(a)$ Define an element.
$(b)$ Identify non-metals from the following elements: Carbon,Potassium,Silicon,Chlorine,Mercury.
$(b)$ Identify non-metals from the following elements: Carbon,Potassium,Silicon,Chlorine,Mercury.
Medium
View SolutionAn element is sonorous and highly ductile. Under which category would you classify this element? What other characteristics do you expect the element to possess?
Easy
View Solution$(i)$ Name the compound formed on heating a mixture of iron filings and sulphur.
$(ii)$ If dilute $HCl$ is added to the above compound,name the gas evolved and write down its two properties.
$(ii)$ If dilute $HCl$ is added to the above compound,name the gas evolved and write down its two properties.
Medium
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