Choose the Best Answer · Q7
Q.Match items in column - I with the items of column – II and assign the correct code.
Column-I
A. Cyanide process
B. Froth floatation process
C. Electrolytic reduction
D. Zone refining
Column-II
(i) Ultrapure Ge
(ii) Dressing of ZnS
(iii) Extraction of Al
(iv) Extraction of Au
(v) Purification of Ni
A B C D
a)
(i)
(ii)
(iii)
(iv)
b)
(iii)
(iv)
(v)
(i)
c)
(iv)
(ii)
(iii)
(i)
d)
(ii)
(iii)
(i) (v)
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Start your 14-day free trial to unlock the full solution →Step 1. A -- Cyanide process: Section 1.2.3 describes cyanide leaching as the method used to extract/concentrate GOLD (4Au + 8CN- + O2 + 2H2O -> 4[Au(CN)2]- + 4OH-), so A matches (iv) Extraction of Au.
Step 2. B -- Froth floatation process: Section 1.2.2 names galena (PbS) and zinc blende (ZnS) as the sulphide ores this method concentrates, so B matches (ii) Dressing of ZnS.
Step 3. C -- Electrolytic reduction: Section 1.5.1 is the Hall-Heroult electrolytic process specifically for aluminium, so C matches (iii) Extraction of Al. …
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