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Home » Assertion: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason: Copper is extracted by hydrometallurgy.
Assertion: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason: Copper is extracted by hydrometallurgy.
CBSE | Chemistry | Class 12 | Exercise 1 | General Principles and Processes of Isolation of Elements | NCERT Exemplar
Assertion: Hydrometallurgy involves dissolving the ore in a suitable reagent followed by precipitation by a more electropositive metal. Reason: Copper is extracted by hydrometallurgy.

(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: Hydrometallurgy involves dissolving iron with a suitable reagent such as water, dilute acid or sodium cyanide solution followed by the precipitation. Low-grade gold and silver are extracted by hydrometallurgy. Their ores are dissolved in a 0.5% NaCN solution with air. These metals are separated from the solution by adding effective metals such as zinc or magnesium. Copper is extracted by pyrometallurgy.

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