(a) Define the following terms :
(i) Ideal solution (ii) Azeotrope (iii) Osmotic pressure
(b) A solution of glucose `(C_(6)H_(12)O_(6))` in water is labelled as 10% by weight. What would be the molality of the solution? (Molar mass of glucose= 180 g `mol^(-1)`)

Explanation

(a) (i) Ideal Solution : The solutions which obey raoult' s law over the entire range of concentration are known as ideal solution.eg-n-hexane and n-heptan
`DeltaH(mix)=0, Delta.V (mix)=0`
(ii) Azeotrope : These are constant boiling mhtures which dishll out unchanged in their composition eg. ethanol and water.
(iii) Osmotic pressur: It is extra pressure which is applied on the solution to just prevent the flow of solvent into the solution through a semi permeable membrane
(b) 10% by weight : 10 gm of glucose in 100 gm of solution
`therefore" "WB=10gm, WA=90g, m ws = 100g`
`MB(C_(6)H_(12)O_(6))=180 g`
`"Molality (m)"=(WB)/(MBxxWA(kg))=(10xx1000)/(180xx90)=0.617 m`