Which of the following is not an example for molecular solid ?

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MgO

I₂

${CO}_{2} (dry ice)$

$H_{2} O (ice)$

answer is C.

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Detailed Solution

In ice, molecules of hydrogen and oxygen are attached together by Van der Waal forces. So, this is an example of molecular solid.
In dry ice molecules of hydrogen and carbon are attached together by Van der Waal forces. So, this is an example of molecular solid.
Magnesium oxide is an ionic solid and that’s why it is not an example of molecular solid.
In I₂, iodine molecules are attached together by Van der Waal forces. So, this is an example of molecular solid.

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