Physical Properties — Prelims Questions

Which of the following elements has the lowest melting point among the 3d transition series elements?

The magnetic moment of a transition metal ion is $3.87,\text{BM}$. What is the number of unpaired electrons in the ion?

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

Which of the following ions is expected to be diamagnetic?

Which of the following statements about the densities of transition elements is correct?

Which of the following factors is primarily responsible for the colour of most transition metal compounds?