Which metal gives a blue borax bead?

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(B) The borax bead test is used to identify transition metal ions. When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it forms a glassy bead of sodium m

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$Co$

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(B) The borax bead test is used to identify transition metal ions. When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it forms a glassy bead of sodium metaborate $(NaBO_2)$ and boric anhydride $(B_2O_3)$. When this bead is heated with cobalt salts,it forms cobalt metaborate,which has a characteristic blue color. The reaction is: $CoO + B_2O_3 \rightarrow Co(BO_2)_2$ (blue bead).

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