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Q.

Find the number of properties which is/are correctly related to graphite. 
1) Most stable allotrope of carbon (thermodynamically) 
2) Highest electrical resistance among all allotropes of carbon
3) It contains dangling bonds
4) C – C covalent bond length is higher as compared to diamond.
5) football like model
6) Hexagonal rings in structure. 

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answer is 3.

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Detailed Solution

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1, 3, 6 are correct.

Delocalization of pi electrons in graphite leads to thermodynamically stability. Graphite and diamond have dangling bonds whereas fullerene does not have dangling bond. Bond length of C-C bond in diamond is 154 pm and in graphite it is 145 pm. It has hexagonal rings in structure.

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