Colour of the bead in borax bead test is mainly due to the formation of
metal oxides
boron oxide
metal metaborates
elemental boron
Information (Borax bead: $NaBO_2 + B_2O_3$ )
In some of the reactions thallium resembles aluminium, whereas in others it resembles with group $-I$ metals. Support this statement by giving some evidences.
Boric acid is an acid because its molecule
In the Hoope's process for refining of aluminium, the fused materials form three different layers and they remain separated during electrolysis also. This is because
In the extraction of aluminium the electrolyte is
Give uses of boron and its compound.
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