(a) Shweta mixed two liquids A and B of $10\text{ mL}$ each. After mixing, the volume of the solution was found to be $20\cdot2\text{ mL}$. (i) Why was there a volume change after mixing the liquids ? (ii) Will there be an increase or decrease of temperature after mixing ? (iii) Give one example for this type of solution. OR (b) (i) How does sprinkling of salt help in clearing the snow covered roads in hilly areas ? (ii) What happens when red blood cells are kept in $0\cdot5% \text{ (mass/vol)}$ $\text{NaCl}$ solution ? Justify your answer. (iii) Write an application of reverse osmosis.