If $5.85 \ g$ of $NaCl$ is dissolved in $90 \ g$ of water,then find out the mole fraction of $NaCl$.

What will be the volume of a $12 \; M$ solution,if it is equivalent to $240 \; mL$ of an $18 \; M$ solution? (Express the answer in $litre$)

State the various methods of expressing the concentration of a solution.

The number of moles of a solute in its solution is $20$ and the total number of moles is $80$. The mole fraction of the solute is:

Match List-$I$ with List-$II$.

List-$I$ (Example)	List-$II$ (Type of Solution)
$A$. Humidity	$I$. Solid in solid
$B$. Alloys	$II$. Liquid in gas
$C$. Amalgams	$III$. Solid in gas
$D$. Smoke	$IV$. Liquid in solid

Choose the correct answer from the options given below:

Dissolving $120 \ g$ of a compound (mol. wt $= 60$) in $1000 \ g$ of water gave a solution of density $1.12 \ g \ mL^{-1}$. The molarity of the solution is: (in $M$)