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Q.

In the icosahedron of B12 unit each boron atom is bonded to ‘x’ boron atoms and in colemanite number of tetrahedral ‘B’ atoms are ‘y’. Then 2x-y is

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answer is 6.

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Detailed Solution

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In icosahedrons structure each Boron is bonded to ‘5’  Boron atoms. In colemanite ‘4’ tetrahedral units are present 2×5-4=6

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