Questions
Which of the following compounds is formed in borax bead test?
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By Expert Faculty of Sri Chaitanya
a
Metaborate
b
Tetraborate
c
Double oxide
d
Orthoborate
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Correct option is A
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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