Complete the following chemical equations:

(i) MnO₄^- + C₂O₄^2- + H⁺→

(ii) KMnO₄

(iii) Cr₂O₇^2- + H₂S + H⁺→

Explain how the phenomenon of adsorption finds application in each of the following processes:

(i) Production of vacuum

(ii) Heterogeneous catalysis

(iii) Froth Floatation process

OR

Define each of the following terms:

(i) Micelles

(ii) Peptization

(iii) Desorption

Describe the principle behind each of the following
processes:

i. Vapour phase refining of a metal.

ii. Electrolytic refining of a metal

iii. Recovery of silver after silver ore was leached with NaCN.

Write the name, stereochemistry and magnetic behaviour of the following:

(Atomic No: Mn = 25, Co = 27, Ni = 28)

(i) K₄[Mn(CN)₆]

(ii) [Co(NH₃)₅Cl]Cl₂

(iii) K₂[Ni(CN)₄]

Answer the following:

(i) Haloalkanes easily dissolves in organic solvents, why?

(ii)What is known as a racemic mixture? Give an example.

(iii)Of the two bromo-derivatives, C₆H₅CH(CH₃)Br and C₆H₅CH( C₆H₅)Br, which one is more reactive in SN₁ substitution reaction and why?