In a complex compound, the central metal ion acts as a:

If the addition of $AgNO_3$ to a solution of $Co(NH_3)_5Cl_3$ results in the precipitation of $AgCl$ corresponding to two ionizable chloride ions,it means that ..............

In the test of $NO_3^-$ ion,a dark brown ring complex is formed. Which of the following statements is incorrect regarding this complex?

The molecular formula of potash alum is

Which of the following compounds is a zero-valent metal complex?

Identify the neutral complex from the following.