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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3ph109

Which of the following oxidations by chlorine (in aqueous solution) are correct?

A $SO X_{2}$ is oxidised to sulphate, $Cl X_{2} + SO X_{2} + 2 H X_{2} O H X_{2} SO X_{4} + 2 HCl$ .
B $Fe X^{3 +}$ is reduced to $Fe X^{2 +}$ .
C $Fe X^{2 +}$ is oxidised to $Fe X^{3 +}$ .
DThiosulphate is oxidised to sulphate.

Answer: A, C, D

Chlorine (

E^{\circ} = 1.36 V

) is a strong oxidant: it oxidises

Fe X^{2 +}

(0.77 V couple),

SO X_{2}

and

S X_{2} O X_{3} X^{2 -}

(to sulphate). It cannot reduce

Fe X^{3 +}

, since it is an oxidant, not a reductant, towards iron.

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