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:
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.Statement I is true but Statement II is false
- C.Both Statement I and Statement II are true
- D.Statement I is false but Statement II is true
Show answer and solution
Correct option: D
Solution
In froth flotation, the rotating paddle agitates the mixture to draw air in (not drive air out), creating froth/bubbles that carry the ore particles to the surface — so Statement I is false.
Iron pyrites (FeS₂) are avoided for iron extraction because roasting them produces SO₂ gas, which is a major air pollutant and cause of acid rain — an environmental concern — making Statement II true.
Iron pyrites (FeS₂) are avoided for iron extraction because roasting them produces SO₂ gas, which is a major air pollutant and cause of acid rain — an environmental concern — making Statement II true.
[JEE Main 2023 · 25 Jan · Shift 2]