d and f Block Elements — Prelims Questions

Which of the following electronic configurations represents a transition element?

The spin-only magnetic moment of $Mn^{2+}$ ion is approximately:

Which of the following pairs of elements have nearly identical atomic radii due to lanthanoid contraction?

Which of the following statements regarding actinoids is INCORRECT?

Which of the following ions is diamagnetic?

Potassium dichromate ($K_2Cr_2O_7$) acts as a strong oxidizing agent in acidic medium. The oxidation state of chromium in $K_2Cr_2O_7$ is: