Question

Which of the following does not represent the
correct order of the properties indicated?
(a) Ni²⁺ > Cr²⁺ > Fe²⁺ > Mn²⁺ (size)
(b) Sc > Ti > Cr > Mn (size)
(c) Mn²⁺ > Ni²⁺ < Co²⁺ (d) Fe²⁺ > Co²⁺ > Ni²⁺ > Cu²⁺ (unpaired electron)

Answer 1

Answer:

I don't know sorry for the inconvenience

Answer 2

(a) Ni²⁺> Cr²⁺> Fe²⁺> Mn²⁺(size)

Explanation:

As we move from left to right of a period in the periodic table, the ionic radii decreases. The ionic radii decreases with the increase in nuclear charge. So Ni2+ ion has a greater ionic radii than Cr2+, which in turn is bigger than Fe2+ ion and Mn2+ ion.

Option A is the answer.