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Colour of the bead in borax bead test is mainly due to the formation of

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Metal oxides

Boron oxides

Metal metaborates

Elemental boron

answer is C.

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Detailed Solution

Borax on strong heating loses its water of crystallization and then shrinks forming a transparent glassy bead of sodium metaborate (NaBO₂) and boric anhydride (B₂O₃) as shown in reaction given below:
Na₂B₄O₇.10H₂O→Na₂B₄O₇+10H₂O
Na₂B₄O₇→2NaBO₂+B₂O₃
Boric anhydride, being non-volatile displaces more volatile acidic oxides and combine with basic oxides present to form metaborates which are identified through their characteristic colours.

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