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JEE Main levelSingle correct optionDifficulty 2 of 3ev020

In a wet scrubber, flue gas is passed through limestone slurry and no oxygen is supplied, so the oxidation state of sulphur does not change. The sulphur containing product formed from $SO X_{2}$ is

A $CaS$
B $CaSO X_{3}$
C $CaSO X_{4}$
D $CaS X_{2} O X_{3}$

Answer: B

The reaction is

CaCO X_{3} + SO X_{2} CaSO X_{3} + CO X_{2}

. Sulphur stays at +4 in

CaSO X_{3}

;

CaS

(S at -2) would require reduction and

CaSO X_{4}

(S at +6) requires oxidation.

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