[MADT Bihar 1982; MP PET 1995]
A) $ Zn $
B) Cobalt
C) Chromium
D) $ Fe $
Correct Answer: B
$ CoO\ +\ B_2O_3\ \xrightarrow{Heat}\ \underset{\text{Copper metabrate (blue)}}{\mathop{Co{{(BO_2)}_2}}} $
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