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Borax bead test is performed on platinum wire. Many transition metals give characteristic colour of metaborate. CoO reacts with B₂O₃ to give Co(BO₂)₂ whose colour is

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green

answer is B.

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Detailed Solution

Metaborates of many transition metals have characteristic colors so borax bead test is used to identify them.

CoO reacts with B₂O₃to give blue bead of Co(BO₂)₂.

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