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The elements X. Y. & Z have 2, 3 & 4 electrons in the outermost orbital respectively. The element which form most basic oxide is

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The elements X. Y. & Z have 2, 3 & 4 electrons in the outermost orbital respectively. The element which form most basic oxide is 

(a)   X 

(b)   Y 

(c)   Z 

(d)  None of the above 

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The most basic oxide is  X.

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