Copper sulphate solution reacts with $KCN$ to give

Arrange the following complexes in the increasing order of conductivity of their solution:
$[Co(NH_{3})_{3}Cl_{3}], [Co(NH_{3})_{4}Cl_{2}]Cl, [Co(NH_{3})_{6}]Cl_{3}, [Cr(NH_{3})_{5}Cl]Cl_{2}$

Which of the following properties does the $CN^-$ ion possess: $(i)$ reducing agent,$(ii)$ oxidizing agent,and $(iii)$ complexing agent?

Which of the following ions forms the most stable complex compound?

Which of the following factors tends to increase the stability of metal ion complexes?

When $100 \ mL$ of $0.2 \ M$ solution of $CoCl_3 \cdot x NH_3$ is treated with excess of $AgNO_3$ solution,$3.6 \times 10^{22}$ ions are precipitated. The value of $x$ is $\left(N_A = 6 \times 10^{23} \ mol^{-1}\right)$