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Question

Which of the following compound will have highest melting point?

A
Zinc chloride
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B
Sodium chloride
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C
Carbon dioxide
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D
Methane
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Solution

The correct option is B Sodium chloride
Sodium chloride will have highest melting point
Sodium chloride is an ionic solid form between sodium ions and chloride ions. There are strong electrostatic forces of attraction between oppositely charged ions. The three dimensional arrangement of cations and anions is such that opposite forces are completely compensated. Hence, ionic solids possess high melting and boiling points.

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