Amongst the following ions which one has the highest magnetic moment value?

• [Cr(H₂O)₆]³⁺
• [Fe(H₂O)₆]²⁺
• [Zn(H₂O)₆]²⁺ 

Write the name of any complex of copper in which the oxidation state of copper is one.

Give one example of chelate complex.

What will be the correct for the wavelengths of absorption in the visible region for the following: , [Ni(NO₂)₆]^{4- _,}  [Ni(NH₃)₆]²⁺, [Ni(H₂O)₆]²⁺? 

What is the rule for writing the names of different ligands (neutral, negative etc.) during the naming of complexes?

Give one example of each complex in which sulphate ion acts as mondenate and bidentate ligand.

How many isomers are there for octahedral complex [CoCl₂(en)(NH₃)₂]⁺

Give one example each for inner orbital complex and outer orbital complex.

Name a complex used in the treatment of cancer.