Usually refractory metals are used in construction of furances because:

they are chemically inert

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their melting point is high

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they can withstand high temperature

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none of the above

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Solution

The correct options are
B they can withstand high temperature
C they are chemically inert
The walls of a furnace should not react with metals or ore. So retractory metals are used as they are chemically inert.

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