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Standard reduction potential of halogens are positive and decreases from fluorine to iodine. Therefore, halogens act as strong oxidising agent and their oxidising power decreases from fluorine to iodine.

1. M1 > MB > MCl > MF. As the size of the anion decreases covalency decreases.
2. Standard reduction potential of halogens are positive and decreases from fluorine to iodine.
3. Halogens act as strong oxidising agent and their oxidising power decreases from fluorine to iodine.
4. Fluorine has -1 oxidation state in most of its compound. Oxidation number of F is +1 in HOF.

Correct answer: Halogens act as strong oxidising agent and their oxidising power decreases from fluorine to iodine.

Solution

The correct statement is that halogens act as strong oxidizing agents, and their oxidizing power decreases from fluorine to iodine due to the decreasing standard reduction potential.

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