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Q.

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

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a

Metaborate

b

Tetraborate

c

Double oxide

d

Orthoborate

answer is A.

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Detailed Solution

Borax on heating gives B2O3, (transparent glassy bead). When hot B2O3, is brought in contact with colored salt metaborates are formed. Na2B4O7⋅10H2O⟶ΔB2O3 substance  Coloured  Metaborate  B2O3 +CoO→Co(BO2)2 blue bead                       cobalt meta borate
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Which of the following compounds is formed in borax bead test?