Question

By the defination of pure substances they have fixed composition and the components are present in a fixed ratio. So why does sugar solution, air etc comes under mixtures ?

Answer 1

Dear Student,

Sugar solution is not a "pure substance" having fixed combination. A solution means a mixture. A solution is a uniform mixture of solute and solvent. A solution is not a compound. Sugar solution means a mixture of sugar (sucrose) and water (normally, that's what it means in general terms, although many solvents are there which can dissolve sucrose).

Air is not a compound/ element. It is a mixture of N₂, O₂, CO₂, H₂, H₂O (vapour), Ar and may more gases.

Regards