Qualitative Analysis - Result Question 42

####45. If metal ions of group III are precipitated by $NH _4 Cl$ and $NH _4 OH$ without prior oxidation by conc. $HNO _3 \ldots \ldots$ is not completely precipitated.

$(1984,1 M)$

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Answer:

Correct Answer: 45. $Fe^{3+}$

Solution:

  1. Because $Fe(OH) _2$ is soluble.


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