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Q.

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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a

green

b

blue

c

red

d

yellow

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 B2O3  to give  blue bead of Co(BO2)2.
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