JEE Main Chemistry question

Not in JEE Main or NEET syllabus

Alkaline earth metal oxide having the co-ordination number four is:

(A)BeOCorrect
(B)MgO
(C)SrO
(D)CaO

Answer: (A)

Solution

BeO, owing to beryllium's very small ionic size, adopts the wurtzite-type structure with tetrahedral (4-fold) coordination. MgO, CaO and SrO (B, C, D), with

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Question ID VK-137980