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In the group analysis the group II A contains
P
(1) \( \mathrm{Pb}^{2+}, \mathrm{As}^{3+} \)
(2) \( \mathrm{Pb}^{2+}, \mathrm{Cu}^{2+} \)
W
(3) \( \mathrm{As}^{3+}, \mathrm{Cu}^{2+} \)
(4) \( \mathrm{Mg}^{2+}, \mathrm{Cu}^{2+} \)
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