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Refractive index of a solid is observed ...

Refractive index of a solid is observed to have the same value along all directions. Comment on the nature of this solid. Would it show cleavage property?

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In a crystal AB having NaCl structure. A atoms occupy the coiners of the cubic unit cel. If all the face centre atoms along one of the axes are removed, what will be the resultant stoichiometric formula of the solid.

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  12. Explain how much portion of an atom located at corner.

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