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$CoSO_4+B_2O_3\rightarrow$(Bead).From this equation the Bead is

$\begin{array}{1 1}(a)\;Cobalt\;metaborate\\(b)\;Cobalt\;borate\\(c)\;Borax\\(d)\;Carbon\;borate\end{array}$

$Co(BO_2)_2$ cobalt metaborate
Hence (a) is the correct answer.