Question

Assertion :$F{e}^{+2}$ is paramagnetic and Se+ is diamagnetic Reason: Unpaired electrons are present in d subshell of $F{e}^{+2}$

• A. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
• B. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
• C. Assertion is correct but Reason is incorrect
• D. Assertion is incorrect but Reason is correct

Answer 1

The correct option is D Assertion is incorrect but Reason is correct

Electronic configuration of $F{e}^{+2}is\left[Ar\right]3d^6{s}^0$ and $S{e}^{+}is\left[Ar\right]3d^{10}4s^{2}4p^3$.

• It's clear that both$F{e}^{+2}$ and $S{e}^{+}$ both are paramagnetic in nature.
  
• $F{e}^{+2}$ has 4 unpaired electrons and in $S{e}^{+}$ has 3 unpaired electrons.