Chemistry-
General
Easy
Question
Assertion:Levigation is used for the separation of oxide ores from impurities.
- If both assertion and reason are true and the reason is the correct explanation of the assertion.
- If both assertion and reason are true but reason is not the correct explanation of the assertion.
- If assertion is true but reason is false.
- If the assertion and reason both are false.
The correct answer is: If assertion is true but reason is false.
Assertion is true but reason is false. Collectors absorbs themselves on polar groups to grains of ores and thus derive them on the surface to pass on into the froth.
Reason:Ore particles are removed by washing in a current of water.
Oxide ores being heavier than the earthy or rocky gangue particles settle down while lighter impurities are washed away.
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Reason:Leaching involves treatment of the ore with a suitable reagent so as to make it soluble while impurities remains insoluble.
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Method used for obtaining highly pure silicon used as a semiconductor material is
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