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JEE Advanced levelOne or more correct optionsDifficulty 3 of 3df107

Acidified $K X_{2} Cr X_{2} O X_{7}$ (dilute $H X_{2} SO X_{4}$ ) is used in the following conversions. Which of them are correct?

A $Fe X^{2 +} \to Fe X^{3 +}$
B $I X^{-} \to I X_{2}$
C $H X_{2} S \to SO X_{4} X^{2 -}$
D $SO X_{3} X^{2 -} \to SO X_{4} X^{2 -}$

Answer: A, B, D

Dichromate (

E^{\circ} = + 1.33 V

) oxidises

Fe X^{2 +}

to

Fe X^{3 +}

,

I X^{-}

to

I X_{2}

and sulfite to sulfate.

H X_{2} S

is oxidised only to sulfur:

Cr X_{2} O X_{7} X^{2 -} + 3 H X_{2} S + 8 H X^{+} \to 2 Cr X^{3 +} + 3 S + 7 H X_{2} O

, so (c) is wrong.

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