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H2O + Br2 → HOBr + HBr. Thus, here oxidation number of Br increases from 0 to +1 and also decreases from 0 to −1. Thus, it is oxidised as well as reduced.

1. F is more electronegative than Cl therefore HF bond is stronger than HCl and hence proton is not given off easily. Hence HF is the weakest hydrohalic acid.
2. Brown bromine vapour will not react with Pieces of marble (CaCO3).
3. Animal charcoal powder can adsorb it.
4. In carbon tetrachloride solution it will dissolve.

Correct answer: In carbon tetrachloride solution it will dissolve.

Solution

Bromine (Br2) is nonpolar and dissolves in nonpolar solvents like carbon tetrachloride (CCl4) due to similar intermolecular forces.

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