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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