Differentiate between the following:

(i) Solution and Colloid

(ii) Homogeneous catalysis and Heterogeneous catalysis

(iii) O/W emulsion and W/O emulsion

(i) Which one of the following is an oligosaccharide: starch, maltose, fructose, glucose

(ii) Write one difference between DNA and RNA.

(iii) Write the name of the disease caused by the deficiency of Vitamin B₁.

Calculate E°_cell for the following reaction at 25^oC:

A + B²⁺(0.001 M) A²⁺(0.0001 M) + B

Given: E_cell = 2.6805, 1 F = 96500 C/mol

A solution is prepared by dissolving 5 g of non-volatile solute in 95 g of water. It has a vapour pressure of 23.375 mm Hg at 25°C. Calculate the molar mass of the solute. (Vapour pressure of pure water at 25°C is 23.75 mm Hg)

(i) Name the method of refining to obtain low boiling metal like mercury.

(ii) What is the role of pine oil in froth floatation process?

(iii) Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?