Which of the following compounds is formed in | vedclass

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(A) In the borax bead test,when borax $(Na_2B_4O_7 \cdot 10H_2O)$ is heated,it loses water of crystallization and swells to form a transparent glassy

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Metaborate

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(A) In the borax bead test,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 $(B_2O_3)$.$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 a transition metal salt,it forms a colored metal metaborate,which is characteristic of the metal ion.

Which of the following compounds is formed in the borax bead test?

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