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I) Fluorine reacts with cold, dilute alkalies liberating O₂ gas.
II) Chlorine reacts with hot, conc. alkalies to form chlorides and chlorates.
III)Bromine reacts with cold, dil. alkali to form bromide and hypobromite
The correct combination is

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Only I and III are correct

Only II and III are correct

Only I & II are correct

Only III is correct

answer is B.

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Detailed Solution

Sodium hydroxide react with fluorine to produce oxygen fluoride, sodium fluoride and water

F2+(dil.) 2NaOH→2NaF+OF2+H2O

Fluorine reacts with cold, dilute alkalis doesn't liberating O₂ gas.
2NaOH(dilute)+Br₂→(cold)NaBrO+NaBr+NaBrO₃
NaOH+Cl₂→NaCl +NaOCl+H₂O .

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