The following observation has occurred in the \( \mathrm{P} \) char...

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The following observation has occurred in the
\( \mathrm{P} \) charcoal cavity test, which cation does it inference?

W "Yellow residue when hot and grey. metal when cold"
(1) \( \mathrm{Pb}^{2+} \)
(2) \( \mathrm{As}^{3+} \)
(3) \( \mathrm{Co}^{2+} \)
(4) \( \mathrm{Ni}^{2+} \)
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