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The Solid State

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Chemistry I

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Chemistry

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The Solid State

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For hcp crystal structure of an element What is the maximum possible coordination number ?

The maximum coordination number is 12 in hcp crystal .

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How many Ca⁺ ions occupy second nearest neighbour locations to a central Cs⁺ ion in caesium chloride crystal?

Co-ordination number of Cs⁺ ion is 8 in the crystal of caesium chloride .

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How many atoms can be assigned to its unit cell if an element forms (i) a body centred cubic cell and (ii) a face centred cubic cell?

(i) for a body centred cubic cell 2 atoms.
(ii)for face centred cubic cell 4 atoms.

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Why is potassium chloride sometimes violet instead of pure white?

This is due to the electrons trapped in anionic vacancies or due to F-centres.

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When high temperature is given to ferromagnetic substance what effect can be obtain ?

As the temperature is raise the ferromagnetic substance starts to become paramagnetic due to randomisation spins.

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