Question

Mathc List - I with List - II

List - I	List - II
A. Concentration of Gold ore	(i) Aniline
B. Leaching of alumina	(ii) $NaOH$
C. Froth stabiliser	(iii) $S{O}_2$
D. Blister copper	(iv) $NaCN$

Choose the correct answer from the options given below.

Answer 1

A. Gold ore is concentrated by leaching using NaCN:

B. Leaching of alumina involves treatment with NaOH to remove some of the impurities:

C. In froth floatation process, aniline is used to stabilise the froth containing sulphide ore.

D. $S{O}_2$ escapes through freshly prepared copper, leaving blisters on its surface.

	(IV) $NaCN$
B. Leaching of alumina	(II) $NaOH$
C. Froth stabiliser	(I) Aniline (Aniline and cresols are used as froth stabilisers in froth floation process)
D. Blister copper	(III) $S{O}_2$ (During self reduction process used in the formation of blister copper $S{O}_2$ gas is evolved)

Hence (B) is most appropriate option.