Question

The co-ordination number and oxidation number of $X$ in the following compound $[X(SO_4)(NH_3)_5]Cl$ will be:

• A. 10 and 3
• B. 2 and 6
• C. 6 and 3
• D. 6 and 4

Answer 1

Answer: (C)

6 and 3

Answer 2

Co-ordination number is the number of ligands a-bonded to metal-atom. Hence, co-ordination number of $X$ in $[X(SO_4)(NH_3)_5]Cl$ is $6$. Let oxidation state of $X$ in the complex be $y$, then- $y+(-2)+5(0)+(-1)=0$ $y-2-1=0$ $y=+3$