30) Which not attributed of the following to its rigid giant polymeric of diamond tetrahedral structure?

Good thermal conductivity

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good abrasive nature

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Poor electrical conductivity

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Both (a) and (b)

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Solution

The correct option is C
Poor electrical conductivity

30) Diamond has a regular tetrahedral arrangement.
Thermal conductivity, abrasive nature of Diamond is due to strong bonding(rigid structure) between carbon atoms.
Diamond is poor conductor of electricity, this is due to no free electrons are present in it because all four valence electrons are participating in bonding.
Each carbon atom is covalently bonded with four other carbon atoms
Therefore, the strength of diamond depends on structural arrangement, and poor electrical conductivity is due to absence of free electrons.
Hence, option C is correct.

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