Question

which of the following element do not exhibit variable oxidation state?
a. copper
b. Mercury
c. calcium
d. iron​

Answer 1

The answer is Copper option (a)

Answer 2

Answer:

The electronic configuration of zinc is [Ar]3d

10

4s

2

.

It can only lose two electrons from the 4s orbital and show +2

oxidation state.

It does not show variable valency.

However, all other transition metals like Mn, Fe, Cr have partially filled d orbitals and hence, show variable valency.

Option C is correct.

Explanation:

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