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Borax on heating with cobalt oxide forms a blue bead of: (A) Co(BO2)2 (B) CoBO2 (C) Co3(BO3)2

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Borax on heating with cobalt oxide forms a blue bead of: 

(A) Co(BO2)2 

(B) CoBO2 

(C) Co3(BO3)2 

(D) Na3Co(BO3)2

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(A) Co(BO2)2

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