JEE Main Chemistry question

Chemistry General Principles and Processes of Isolation of Elements (Metallurgy)JEE Main

Not in JEE Main or NEET syllabus

Forth floatation method is successful in separating impurities from ores because

(A)The pure ore is soluble in water containing additives like pine oil, cresylic acid etc
(B)The pure ore is lighter than water containing additives like pine oil, cresylic acid, etc
(C)The impurities are soluble in water containing additives like pine oil, cresylic acid, etc
(D)The pure ore is not easily wetted by water as by pine oil, cresylic acid, etcCorrect

Answer: (D)

Solution

Froth flotation exploits a difference in surface wettability: sulphide ore particles are preferentially wetted by oily collectors like pine oil/cresylic acid and are not easily wetted by water, so they stick to air

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Question ID VK-145216