Which of the following compounds is formed as | vedclass

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(A) When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it loses water of crystallization and swells to form a transparent glassy bead consisting of sodi

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$Co(BO_2)_2$

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(A) When borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it loses water of crystallization and swells to form a transparent glassy bead consisting of sodium metaborate $(NaBO_2)$ and boric anhydride $(B_2O_3)$.When this bead is heated with cobalt oxide $(CoO)$ in an oxidizing flame,it forms cobalt metaborate,which is blue in color.The reaction is as follows:$CoO + B_2O_3 \rightarrow Co(BO_2)_2$ (Cobalt metaborate,blue bead).

Which of the following compounds is formed as a blue bead when borax is heated with cobalt oxide?

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