Question

What is the name of the coordination compound K4[Ni(CN)6]?

a) Potassium hexacyanidonickelate(II)
b) Tetrapotassium nickel(II) hexacyanide
c) Potassium tetracyanonickelate(II)
d) Potassium hexaaminonickel(II) sulfate

Answer 1

The name for the compound K4[Ni(CN)6] is 'potassium hexacyanidonickelate(II)', which corresponds to option (a).

Step-by-step explanation:

The name of the coordination compound K4[Ni(CN)6] is potassium hexacyanidonickelate(II). This answer corresponds to option (a). In naming coordination compounds, the cation is named before the anion. Since the complex ion carries a negative charge, the metal is named with an '-ate' suffix, and its oxidation state is given in Roman numerals in parentheses.

Here, 'hexa' indicates six cyanide ligands, 'cyano' is the ligand name, 'nickel' is the metal, and '(II)' indicates the oxidation state of nickel.