In a face centred lattice of \( X \) and \( Y, X \) atom are present at the corners while \( Y \...

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In a face centred lattice of \( X \) and \( Y, X \) atom are present at the corners while \( Y \) atoms at the face centres.
(a) What is the formula of compound?
(b) What would be the formula of the compound if
(i) Two atoms of \( X \) are missing from the corner.
(ii) One of the \( X \) atoms is missing from a corner is replaced by \( Z \) atoms(also monovalent).
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