Question

Given below are two statements:
Statement I : In froth floatation method a rotating paddle agitates the mixture to drive air out of it.
Statement II : Iron pyrites are generally avoided for extraction of iron due to environmental reasons.
In the light of the above statements, choose the correct answer from the options given below:

• A. Both Statement I and Statement II are false
• B. Both Statement I and Statement II are true
• C. Statement I is false but Statement II is true
• D. Statement I is true but Statement II is false

Answer 1

The Correct Option is C

To determine the correctness of each statement, we need to evaluate the concepts involved in froth floatation and the extraction of iron from iron pyrites:

1. Statement I: In froth floatation method, a rotating paddle agitates the mixture to drive air out of it.
   • Froth floatation is a process used primarily for the beneficiation of sulphide ores. In this method, the ore is mixed with water and a foaming agent, and air is introduced to create froth.
   • The purpose of agitating the mixture is to introduce air bubbles, not to drive air out. The sulphide ore particles attach to the air bubbles and rise to the surface as froth, leaving impurities behind.
   • Therefore, Statement I is incorrect because the agitation is meant to introduce air into the mixture, not remove it.
2. Statement II: Iron pyrites are generally avoided for extraction of iron due to environmental reasons.
   • Iron pyrites (FeS₂), also known as fool's gold, contains sulfur. When used for iron extraction, it releases sulfur dioxide gas, which causes pollution and acid rain.
   • Due to these environmental concerns, iron pyrites are not preferred for iron extraction compared to other ores like hematite or magnetite, which contain less sulfur.
   • Thus, Statement II is true as iron pyrites pose significant environmental issues during extraction.

Based on the analysis, the correct answer is: Statement I is false but Statement II is true.