Question

Match List-I with List-II.

	List I		List II
A.	Concentration of	i	Aniline
B.	Leaching of alumina	ii	NaOH
C.	Froth stabilizer	iii	\(SO_2\)
D.	Blister copper	iv	NaCN

Choose the correct answer from the options given below.

• A. (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
• B. (A)-(IV), (B)-(II), (C)-(I), (D)-(III)
• C. (A)-(III), (B)-(II), (C)-(I), (D)-(IV)
• D. (A)-(II), (B)-(IV), (C)-(III), (D)-(I)

Answer 1

The Correct Option is B

To solve this question, we need to match the items in List I with their corresponding pairs in List II based on chemical processes or properties. Let's analyze each pair one by one:

1. Concentration of:
   • This involves the process of concentrating the ore by removing the impurities. Typically, sodium cyanide (NaCN) is used in the process of concentration, especially for gold, through a method known as cyanide leaching.
2. Leaching of alumina:
   • In the context of alumina, it is leached using sodium hydroxide (NaOH). This process is part of the Bayer process for refining bauxite to produce alumina.
3. Froth stabilizer:
   • Froth flotation is a method used to separate hydrophobic materials from hydrophilic ones. Common froth stabilizers include substances like aniline or cresols which help maintain the froth during the flotation process.
4. Blister copper:
   • Blister copper is obtained in the smelting of copper sulfide ores and often contains sulfur dioxide (SO_2) which gives the characteristic "blistered" appearance due to the trapped gas.

Based on our analysis, the correct match is:

• (A) Concentration of - (iv) NaCN
• (B) Leaching of alumina - (ii) NaOH
• (C) Froth stabilizer - (i) Aniline
• (D) Blister copper - (iii) SO_2

Thus, the correct answer is option: (A)-(IV), (B)-(II), (C)-(I), (D)-(III).