Question

Which of the following displaces oxygen from water?

• A. ${\mathrm{F}}_2$
• B. ${\mathrm{Cl}}_2$
• C. ${\mathrm{Br}}_2$
• D. ${\mathrm{I}}_2$

Answer 1

The correct option is A

${\mathrm{F}}_2$

Explanation for correct option:

A. ${\mathrm{F}}_2$

• In the electrochemical series, the ones having higher negative electrode potential are the stronger oxidizing agents.
• Fluorine$\left(\mathrm{F}\right)$ lies above in that series which means it is a stronger oxidizing agent.
• Displacement of oxygen from water basically means the oxidation of oxygen present in the water molecule.
• The oxidation of an atom can be done by the atom which is a much stronger oxidizing agent.
• Among the given halogens, Fluorine has the tendency of gaining electrons due to higher negative reduction potential and hence it displaces oxygen from water by a vigorous reaction.

Explanation for incorrect options:

Fluorine displaces oxygen from water. Thus, options B, C, and D are incorrect.

Hence, the correct option is A i.e. ${\mathrm{F}}_2$.