Which of the following compounds is formed in | vedclass

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(A) Answer:- $(A)$ MetaborateOn heating,borax loses its water of crystallization and swells up to form a fluffy mass. On further heating,it melts to g

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Metaborate

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(A) Answer:- $(A)$ MetaborateOn heating,borax loses its water of crystallization and swells up to form a fluffy mass. On further heating,it melts to give a clear liquid which solidifies to a transparent glassy bead consisting of sodium metaborate and boric anhydride.$Na_{2}B_{4}O_{7} \cdot 10H_{2}O$ $\xrightarrow{\Delta} Na_{2}B_{4}O_{7}$ $\xrightarrow{\Delta} 2NaBO_{2} + B_{2}O_{3}$In the presence of transition metal oxides,the bead forms colored metal metaborates,e.g.,$CoO + B_{2}O_{3} \rightarrow Co(BO_{2})_{2}$. Thus,metaborate is the key component formed.

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

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