Complete and balance the following chemical equations :

(a) Fe ²⁺ + MnO₄^- + H⁺ → ^�

(b) MnO₄^-+ H ₂O + I ^– →

Among the hydrides of Group-15 elements, which have the

(a) Lowest boiling point ?

(b) Maximum basic character ?

(c) Highest bond angle ?

(d) Maximum reducing character?

How do you convert the following ?

(a) Ethanal to Propanone

(b) Toluene to Benzoic acid

OR

Account for the following :

(a) Aromatic carboxylic acids do not undergo Friedel-Crafts reaction.

(b) pK_a value of 4-nitrobenzoic acid is lower than that of benzoic acid.

Give reasons for the following :

(a) Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.

(b) Aquatic animals are more comfortable in cold water than in warm water.

(c) Elevation of the boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.

An element ‘X’ (At. mass = 40 g mol^–1) having f.c.c. structure, has unit cell edge length of 400 pm. Calculate the density of ‘X’ and the number of unit cells in 4 g of ‘X’. (N_A = 6.022 × 10²³ mol^–1 )