Most predominantly ionic compounds are obtained by the combination of the groups :

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I and VII

II and VI

lV and VIII

III and V

answer is A.

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Detailed Solution

I A group elements lose electrons readily (they are the most electro-positive) and VII A group elements gain electrons easily, which results in a highly ionic compound when these two groups of elements are combined (electro-negative). Therefore, it is simple to ionise the complex these elements create.

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