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Name the metl that is purified by plcing the impure metal on sloping hearth of reverberatory furnace and heating that above its melting point in the a

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Name the metl that is purified by plcing the impure metal on sloping hearth of reverberatory furnace and heating that above its melting point in the absence of air
A. mercury
B. gallium
C. ziroconium
D. copper
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During the pruification of copper metal an impure metal is placed on sloping hearth of a reverberatory furnace and heated that above its melting point in the absenece of air
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