The colour of the bead in the borax bead test | vedclass

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(C) Borax on strong heating loses its water of crystallization and then shrinks,forming a transparent glassy bead of sodium metaborate $(NaBO_2)$ and

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metal metaborates

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(C) Borax on strong heating loses its water of crystallization and then shrinks,forming a transparent glassy bead of sodium metaborate $(NaBO_2)$ and boric anhydride $(B_2O_3)$ as shown in the reaction below:$Na_2B_4O_7 \cdot 10H_2O \rightarrow Na_2B_4O_7 + 10H_2O$$Na_2B_4O_7 \rightarrow 2NaBO_2 + B_2O_3$Boric anhydride,being non-volatile,displaces more volatile acidic oxides and combines with basic metal oxides present to form coloured metal metaborates,which are identified through their characteristic colours.

The colour of the bead in the borax bead test is mainly due to the formation of:

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