Q.

Formula and colour of cobalt metaborate is

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a

CoBO23, Yellow

b

CoBO22, Red

c

CoBO23, Green

d

CoBO22, Blue

answer is D.

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Detailed Solution

Na2B4O7.10H2O→∆Na2B4O7→fuseNaBO2+B2O3colour less glassy beadCoO+B2O3→ CoBO22Blue .
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