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Which of the following oxides have rock salt structure with coordination number 6 : 6

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BeO

MgO

CaO

SrO

answer is B, C, D.

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Detailed Solution

$M g^{2 +} a n d O^{2 -}$ both contan 10 electrons and are isoelectronic. Similarly $C a^{2 +} a n d O^{2 -}$ each contain 18 electrons and 10 electrons.

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