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Question

Which of these metals cannot be obtained by reduction using C as reducing agent?

A
copper
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B
zinc
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C
lead
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D
potassium
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Solution

The correct option is B potassium
Carbon is a reducing agent at higher temperatures and from the electrochemical potential point of view or reactivity series carbon is present above many important metals e.g. zinc,iron,copper,silver,gold so it is used to reduce their oxides to extract metals from them but Carbon is present below Potassium so it is not used as reducing agent for its extraction.

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