Question

$2.33$g of compound X(empirical formula $Co{H}_{12}{N}_{4}C{l}_3)$ upon treatment with excess $AgN{O}_3$ solution produces $1.435$g of a white precipitate. The primary and secondary valences of cobalt in compound X, respectively, are.
[Given : Atomic mass: $Co=59,Cl=35.5,Ag=108$].

• A. $3,6$
• B. $3,4$
• C. $2,4$
• D. $4,3$

Answer 1

The correct option is A $3,6$

Since $0.01$ mole of $X$ produces $0.01$ mole of $AgCl$,hence one $C{l}^{-}$ is out of coordination sphere or complex is $\left[CO\right(N{H}_3{)}_{4}C{l}_2]Cl$ AND HENCE $CO(3+)$,has $6$ coordination number