MHT CET · Chemistry · s Block Elements

Which halide of magnesium has the highest ionic character?

A Chloride
B Bromide
C Iodide
D Fluoride

Verified Solution

Answer & Solution

Correct Answer

(D) Fluoride

Step-by-step Solution

Detailed explanation

Size of anion is

I^{-} > B r^{-} > C l^{-} > F^{-}

. As the size increases, polarisation of an anion is more, hence when covalent character increases ionic character decreases.
Order of ionic character is

M g F_{2} > M g C l_{2} > M g B r_{2} > M g I_{2}

Hence Magnesium fluoride has the highest ionic character.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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