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Q.

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

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a

Elemental boron

b

Metal oxides

c

Metal metaborates

d

Boron oxides

answer is C.

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Detailed Solution

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Borax on strong heating loses its water of crystallization and then shrinks forming a transparent glassy bead of sodium metaborate (NaBO2​) and boric anhydride (B2​O3​) as shown in reaction given below:
Na2​B4​O7​.10H2​O→Na2​B4​O7​+10H2​O
Na2​B4​O7​→2NaBO2​+B2​O3​
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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