(b) $\left\lbrack Co\left( {NH}_{3} \right)_{6} \right\rbrack\left\lbrack Cr\left( C_{2}O_{4} \right) \right\rbrack_{3}$ its IUPAC name is hexa amine cobalt (III) tris (oxalato) chromate (III).
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Ph.D. in Physics with 19+ years of teaching experience.