Q.

The metal which can form predominantly stable halide of the formula MX (X =halogen) belongs to group

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a

I

b

II

c

III

d

IV

answer is A.

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Detailed Solution

Element (I) has low ΔiH1 but a very high ΔiH2 value. It has less negative Δeg H value. So, element (I) is alkali metal which forms predominantly stable halide of the formula MX.
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The metal which can form predominantly stable halide of the formula MX (X =halogen) belongs to group