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Neutral refractory material used in furn...

Neutral refractory material used in furnaces is :

A

`AI_(2)O_(3)`

B

`SiO_(2)`

C

`CaO`

D

`Fe_(2)O_(3)`

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The correct Answer is:
C
Lime is basic in nature
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ALLEN-METALLURGY-EXERCISE-02
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  13. Metallury involves steps :

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