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Q.

Electric furances are lined with magnesia because:

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a

it liberates oxygen on heating

b

it is not affected by acids

c

it has no effect of electricity

d

it melts only at very high temperature

answer is C.

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Detailed Solution

Electric furnaces are lined with magnesia because it melts only at very high temperatures.

Magnesia, which melts at very high temperatures and which can sustain high temperatures, is used to line electric furnaces.

Hence, option C is correct.

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