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Question

Which metal can be obtained by reduction of its oxide by H2 gas?

A
Ni
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B
Sn
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C
Mg
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D
W
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Solution

The correct option is D W

Pure tungsten can't be obtained by reducing tungsten(VI) oxide using carbon, because it reacts with carbon to make tungsten carbide. Instead, the reducing agent is hydrogen.

The extraction process

Powdered tungsten(VI) oxide is heated to temperatures in the range 550 - 850°C in a stream of hydrogen.

Therefore, the option is D.


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