Question

Match the column I with column II and mark the appropriate choice.

	Column I		Column II
(A)	Calcination	(i)	$C{r}_2+2Al\to 2Cr+A{l}_2{O}_3$
(B)	Roasting	(ii)	$FeC{O}_3\to FeO+C{O}_2$
(C)	Smelting	(iii)	$2ZnS+3O_2\to ZnO+2S{O}_2$
(D)	Aluminothermy	(iv)	$PbO+C\to Pb+CO$

• A. (A) $\to$ (i), (B) $\to$ (ii), (C) $\to$ (iii), (D) $\to$ (iv).
• B. (A) $\to$ (iv), (B) $\to$ (iii), (C) $\to$ (ii), (D) $\to$ (i).
• C. (A) $\to$ (iii), (B) $\to$ (ii), (C) $\to$ (i), (D) $\to$ (iv).
• D. (A) $\to$ (ii), (B) $\to$ (iii), (C) $\to$ (iv), (D) $\to$ (i).

Answer 1

The correct option is D (A) $\to$ (ii), (B) $\to$ (iii), (C) $\to$ (iv), (D) $\to$ (i).

• Calcinaton involves heating. It removes the volatile matter which escapes leaving behind the metal oxide.
  
• Here, $FeC{O}_3\to FeO+C{O}_2$ is a process of Calcination.
• In roasting, the ore is heated in a regular supply of air in a furnace at a temperature below the melting point of the metal.
  
• Here,$2ZnS+3O_2\to ZnO+S{O}_2$ is a roasting process.
• Smelting is a process of applying heat to ore in order to extract out a base metal. It is a form of extractive metallurgy. It is used to extract many metals from their ores, including silver, iron, copper, and other base metals.
  
• Here, $PbO+C\to Pb+CO$
• Aluminothermy is a process for reducing metallic oxides using finely divided aluminium powder. The mixture of aluminium and the oxide is ignited, causing the aluminium to be oxidized and the metal oxide to be reduced to the metal.
  
• Here,$C{r}_2+2Al\to 2Cr+A{l}_2{O}_3$ is an Aluminothermy process.
• Hence,option D is correct answer.