Question

The IUPAC name of $K_2\left[Zn{\left(OH\right)}_4\right]$ is:

• A. Potassium tetrahydroxyzinc(II)
• B. Potassium tetrahydroxozincate(II)
• C. Potassium tetrahydroxyzincate(VI)
• D. Potassium hydroxyzinc(II)

Answer 1

The correct option is B Potassium tetrahydroxozincate(II)

First we note that the name of the counter ion is potassium now we write the name of the complex ion.
It contains zinc(II), so it will be called as zincate(II). Note that we can determine the oxidation number of zinc by charge balance. Also it contains 4 $O{H}^{-}$ groups so it will be tetrahydroxo. Combining, we get that the name of the negative ion as tetrahydroxozincate(II)
So, the name of the compound becomes Potassium tetrahydroxozincate(II).
B is the correct answer.