Which one of the following ions does not give borax bead test? (a) \( \mathrm{Cr}^{3+} \) (b) \(...

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Which one of the following ions does not give borax bead test?
(a) \( \mathrm{Cr}^{3+} \)
(b) \( \mathrm{Cu}^{2+} \)
(c) \( \mathrm{Mn}^{2+} \)
(d) \( \mathrm{Zn}^{2+} \)
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