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Assertion: Sulphide ores are concentrated by Froth Flotation method. Reason: Cresols stabilise the froth in the Froth Flotation Method.
Assertion: Sulphide ores are concentrated by Froth Flotation method. Reason: Cresols stabilise the froth in the Froth Flotation Method.
CBSE | Chemistry | Class 12 | Exercise 1 | General Principles and Processes of Isolation of Elements | NCERT Exemplar
Assertion: Sulphide ores are concentrated by Froth Flotation method. Reason: Cresols stabilise the froth in the Froth Flotation Method.

(i) Both assertion and reason are true and the reason is the correct explanation of assertion.

(ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.

(iii) The assertion is true but the reason is false.

(iv) The assertion is false but the reason is true.

(v) Assertion and reason both are wrong.

 

Correct Answer: (ii) Both assertion and reason are true but the reason is not the correct explanation of assertion.

Explanation: This process is most suitable for sulphide ores. This process is based on the moisturizing properties of various ore and gangue particles in water and pine oil. The metal is moistened with oil and the impurities are soaked in water. The ore particles are immersed in potassium or sodium ethyl xanthate (as a collector) and then come up with a froth. Froth stabilizer (cresols, aniline) strengthens the froth.

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