MCQ
$X$ is

- A

- B

- ✓

- D








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$Fe ^{2+}( aq )+ S ^{2-}( aq ) \rightleftharpoons FeS ( s )$
When equal volumes of $0.06 M Fe ^{2+}( aq )$ and $0.2 M S ^{2-}( aq )$ solutions are mixed, the equilibrium concentration of $Fe ^{2+}$ (aq) is found to be $Y \times 10^{-17} M$. The value of $Y$ is. . . . .
| LIST $I$ (Technique) | LIST $II$ (Application) |
| $A$. Distillation | $I$. Separation of glycerol from spent-lye |
| $B$. Fractional distillation | $II$Aniline - Water mixture |
| $C$. Steam distillation | $III$Separation of crude oil fractions |
| $D$. Distillation under reduced pressure | $IV$.ChloroformAniline |
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