(B) The borax bead test is used to identify transition metal ions. When cobalt salts are heated with borax $(Na_2B_4O_7 \cdot 10H_2O)$,they form cobal

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(B) The borax bead test is used to identify transition metal ions. When cobalt salts are heated with borax $(Na_2B_4O_7 \cdot 10H_2O)$,they form cobalt metaborate,which is blue in color. The reaction is: $CoO + B_2O_3 \xrightarrow{\text{Heat}} Co(BO_2)_2$ (Cobalt metaborate,blue).