Chemistry - Metallurgy Question with Solution | TestHub
How many of the following pair is CORRECTLY matched?
(I) Zone refining : Silicon
(II) Poling : Sn
(III)Van Arkel method : Titanium
(IV) Froth floatation method : Calamine
(V) Puddling : Wrought iron
(VI) Calcination : Sphalerite
(VII) Carbon reduction : Bauxite
Answer:
Solution:
Correct pairs: (I) Zone refining is used for semiconductors like Silicon; (II) Poling purifies Tin (Sn); (III) Van Arkel method refines Titanium (Ti); (V) Puddling is used to manufacture Wrought iron.
Incorrect pairs: (IV) Froth flotation is for sulfide ores, but Calamine (ZnCO₃) is a carbonate ore; (VI) Calcination is for carbonates/hydroxides, but Sphalerite (ZnS) requires roasting; (VII) Bauxite undergoes electrolytic reduction, not carbon reduction.
Conclusion: Exactly 4 pairs—namely (I), (II), (III), and (V)—are correctly matched, making the final answer 4.00.
