Which of the following compounds is formed in Borax bead test ?
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a
Metaborate
b
Tetra borate
c
Double oxide
d
Ortho borate
answer is A.
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Detailed Solution
Borax on heating gives B2O3 (transparent glassy mass) when hot B2O3 is brought in contact with a coloured salt, Metaborates are formedNa2B4O7.10H2O→HeatB2O3→substanceColouredMetaborate Borax∴ CuSO4+B2O3→CuBO22+SO3