JEE Main Chemistry question

The pair of elements which on combination are most likely to form an ionic compound is:

(A)Na and Ca
(B)K and Correct
(C) and
(D)Al and

Answer: (B)

Solution

An ionic compound forms most readily between a strongly electropositive metal and a strongly electronegative non-metal. K (a reactive alkali metal) and combine to give the ionic compound (potassium superoxide). Na and Ca are both metals (do not form an ionic compound with

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Question ID VK-133633