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Roasting

In the proces...

Question

In the process of extraction of metals, roasting could be utilised for:

A

Metal sulphides

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B

Metal oxides

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C

Metal fluorides

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D

Metal carbides

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Solution

The correct option is A
Metal sulphides

In the process of extraction of metals, sulphide ores are converted into oxides by heating strongly in the presence of excess air. This process is known as roasting. In this process, sulphur dioxide is also formed.

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Q. Question 39
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?

Q. Question 39
Why should the metal sulphides and carbonates be converted to metal oxides in the process of extraction of metal from them?

Q. The sulphide ores are generally roasted to oxide for the extraction of metals instead of being directly

Q. Assertion :The metal sulphides and carbonates are converted to metal oxides in the process of extraction of metal from them. Reason: Easier to obtain metal from its oxide, as compared from its sulphides and carbonates.

Among the methods for extracting metals from their ores, i.e., 1. roasting a metal sulphide, 2. chemical reduction of a metal oxide, and 3. electrolysis, the preferred method depends on

E^{\circ}

value for the reducing half-reaction:

M^{n +} (a q) + n e^{-} \to M (s)

What are the criteria of selection of a good reducing agent for extraction of metals?

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