Question

In which of the following compounds does manganese have the maximum radius?

• A.
• B.
• C.
• D. _6]\)

Answer 1

The correct option is C

We already know that if the positive charge is higher, effective nuclear charge on the electrons remaining increases and size decreases.

Therefore, higher charge ⇒ smaller size

$Mn{O}_2\to M{n}^{+4}$

$MnO\to M{n}^{+2}$

$KMn{O}_4\to M{n}^{+6}$

$K_3\left[Mn\right(CN{)}_6]\to M{n}^{+3}$

So, the answer should be $KMn{O}^4$