Q45. An octahedral complex with the formula $\mathrm { CoCl } _ { 3 } \cdot \mathrm { nNH } _ { 3 }$ upon reaction with excess of $\mathrm { AgNO } _ { 3 }$ solution gives 2 moles of AgCl . Consider the oxidation state of Co in the complex is ' $x$ '. The value of " $x + n$ " is $\_\_\_\_$\\
(1) 6\\
(2) 8\\
(3) 3\\
(4) 5