CBSE Class 12 Chemistry 2017 Delhi Set 2 Solved Paper

Question : 5 of 10

Marks: +1, -0

Define the following terms:
(i) Ideal solution
(ii) Molarity (M)

Solution:

(i) An ideal solution which obeys Raoult's law over entire range of concentration. The necessary condition to reach ideal solution is:
Enthalpy of mixing of the pure components to form the solution,

∆ {\H}_{\;\text "mix "\;}=0

and volume of mixing,

∆ {\V}_{\;\text "mix "\;}=0

(ii) Molarity is defined as the number of moles of solute present in

1000 {\mL}

of the solution. Molarity is represented by

{\M}

{\M}=\;{\;\text " Number of moles of solute "\;}/{\;\text " Volume of solution in "\; {\mL}} × 1000

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