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In which of the following patterns, the carbon layers are arranged in the graphite potassium structure, C8K?

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In which of the following patterns, the carbon layers are arranged in the graphite potassium structure, C8K?

(a) AAAAAA

(b) ABABAB

(c) ABCABC

(d) CBACBA

I have been asked this question in examination.

My question is based upon Modification of Existing Structures by Ion Exchange and Intercalation Reactions topic in chapter Preparative Methods of Solid State Chemistry

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The correct answer is (a) AAAAAA

The explanation: In the graphite potassium C8K structure, the carbon layers are different to those in the pure graphite structure and they are arranged in the form of AAAA pattern where the potassium ions are sandwiched between pairs of carbon rings.

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