Question

From the following identify pairs in which metal is correctly matched with its refining process: 

• A. A, B, C only
• B. B, D only
• C. A, C, D only
• D. A, B, C, D

Hint:

In refining, different metals require specific techniques based on their physical properties like boiling point, melting point, and reactivity. Always check these properties to match the metal with its correct refining process.

Answer 1

The Correct Option is D

Understanding each metal's refining process: 
A. Zn - Distillation: Zinc is refined by distillation due to its low boiling point, separating it from impurities with higher boiling points.
B. Sn - Liquation: Tin is refined using liquation, where impurities with different melting points are separated by heating the metal.
C. Ga - Zone refining: Gallium is refined by zone refining, where a molten zone moves along the metal, effectively purifying it by removing impurities.
D. Zr - Vapour phase refining: Zirconium is refined using vapour phase refining, where it reacts with chlorine to form ZrCl4, which is then distilled. Thus, all the given pairs are correct.