Which of the following substance has the highest melting point ? (a...

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Which of the following substance has the highest melting point ?
(a) \( \mathrm{NaCl} \)
(b) \( \mathrm{KCl} \)
(c) \( \mathrm{MgO} \)
(d) \( \mathrm{BaO} \)
\( \mathrm{P} \)
W
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