When borax is heated with cobalt oxide,which | vedclass

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(A) The borax bead test is used to identify transition metal ions. When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it loses water and forms a glassy

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$Co(BO_2)_2$

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(A) The borax bead test is used to identify transition metal ions. When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it loses water and forms a glassy bead of sodium metaborate $(NaBO_2)$ and boric anhydride $(B_2O_3)$.$Na_2B_4O_7 \cdot 10H_2O \xrightarrow{\Delta} Na_2B_4O_7 + 10H_2O$$Na_2B_4O_7 \xrightarrow{\Delta} 2NaBO_2 + B_2O_3$When this bead is heated with cobalt oxide $(CoO)$,it forms cobalt metaborate,which is blue in color.$CoO + B_2O_3 \rightarrow Co(BO_2)_2$ (Cobalt metaborate,blue bead).

When borax is heated with cobalt oxide,which of the following compounds produces a blue-colored bead?

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