Which of the following does not provide evidence that an unknown compound could be a covalent network solid?

The sample feels hard to the touch.

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The conductivity of the sample increases with temperature.

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The sample has a high melting point.

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The sample is observed to conduct electricity in aqueous solution.

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Solution

The correct option is D The sample is observed to conduct electricity in aqueous solution.
The sample is observed to conduct electricity in aqueous solution because due to strong intermolecular force of attraction the covalent network solid does not conduct electricity in solid state.

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