Question

Match items of Column I with the items of Column II and assign the correct code :

$\begin{array}{cccc}& \text{Column - I}& & \text{Column - II}\\ \left(a\right)& \text{Cyanide process}& \left(i\right)& \text{Ultrapure Ge}\\ \left(b\right)& \text{Froth floatation}& \left(ii\right)& \text{Dressing of ZnS}\\ \left(c\right)& \text{Electrolytic}& \left(iii\right)& \text{Extraction of Al}\\ \left(d\right)& \text{Zone refining}& \left(iv\right)& \text{Extraction of Au}\\ & & \left(v\right)& \text{Purification of Ni}\end{array}$

• A. (a) - (ii) (b) - (iii) (c) - (i) (d) - (v)
• B. (a) - (i) (b) - (ii) (c) - (iii) (d) - (iv)
• C. (a) - (iii) (b) - (iv) (c) - (v) (d) - (i)
• D. (a) - (iv) (b) - (ii) (c) - (iii) (d) - (i)

Answer 1

The correct option is D

(a) - (iv) (b) - (ii) (c) - (iii) (d) - (i)

Electrolytic refining is used to purify Al because of its high reactivity.

Gold cyanation is a hydrometallurgical process which is used to extract gold from low grade ores.

Froth floatation is a process that is used to separate hydrophilic and hydrophobic substances in ore refining.

Zone refining is used to produce very high purity i.e. ~99.99999% pure Ge for semi conductor industry.