\( \mathrm{MgO} \) is used for lining furnaces because : (a) of hig...

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\( \mathrm{MgO} \) is used for lining furnaces because :
(a) of high melting point of \( \mathrm{MgO} \)
(b) \( \mathrm{MgO} \) is a very good conductor of heat
\( \mathrm{P} \)
(c) \( \mathrm{MgO} \) is an electrical insulator
(d) None of these
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