Qualitative Analysis - Result Question 40
Passage
$p$-amino-N, N-dimethylaniline is added to a strongly acidic solution of $X$. The resulting solution is treated with a few drops of aqueous solution of $Y$ to yield blue colouration due to the formation of methylene blue. Treatment of the aqueous solution of $Y$ with the reagent potassium hexacyanoferrate (II) leads to the formation of an intense blue precipitate. The precipitate dissolves on excess addition of the reagent. Similarly, treatment of the solution of $Y$ with the solution of potassium hexacyanoferrate (III) leads to a brown colouration due to the formation of $Z$.
43. The compound $Z$, is
(a) $Mg _2\left[Fe(CN) _6\right]$
(b) $Fe\left[Fe(CN) _6\right]$
(c) $Fe _4\left[Fe(CN) _6\right] _3$
(d) $K _2 Zn _3\left[Fe(CN) _6\right] _2$
Show Answer
Answer:
Correct Answer: 43. (b)
Solution:
Compound $Z$ is $Fe\left[Fe(CN) _6\right]$.
BETA
