233) How many EDTA molecules are required to make an octahedral complex with a Ca²⁺ ion?

234) The spin only magentic moment of Ni²⁺ in aqueous solution would be:

235) The coordination number and oxidation state of element E in the complex [E(en)₂(C₂O₄)]NO₂ are respectively:

236) For the given complex [CoCl₂(en)(NH₃)₂]⁺, the number of geometrical isomers, optical isomers and total number of isomers of all possible types are respectively:

237) The green layer formed on Cu in atmosphere is due to the formation of: