Read the following short write up and answer subsequent questions based on observations( \( A) \...

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Read the following short write up and answer subsequent questions based on observations( \( A) \) to \( (J) \).
\begin{tabular}{|c|c|}
\hline white ppt. soluble in aq. \( \mathrm{NH}_{3} \) \\
\hline coloured ppt. soluble in excess \( \mathrm{NaOH} \) & \( \mathrm{NaOH} \) \\
green coloured solution \\
of a compound \( (A) \)
\end{tabular}
Compound \( A \) and \( B \) are respectively:
(a) \( \mathrm{FeCl}_{2} ; \mathrm{FeCl}_{3} \)
(c) \( \mathrm{CrCl}_{3} ; \mathrm{K}_{2} \mathrm{CrO}_{4} \)
(b) \( \mathrm{CuCl}_{2} \cdot 2 \mathrm{H}_{2} \mathrm{O} ;\left[\mathrm{CuCl}_{4}\right]^{-2} \)
(d) \( \mathrm{NiCl}_{2} ; \mathrm{NiCl}_{2} \)
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