Which of the following element has the highest density among transition metals?

Which of the following statement is correct?

What is the common oxidation state of scandium? (At. No. of Sc = 21)

Which of the following is not a consequence of lanthanide contraction?

In lanthanides, Ce changes from +4 to +3 oxidation state.

Which of the following is Baeyer’sreagent?

The decrease in atomic size of the d-block elements in a series is small after midway.

Mn has a maximum oxidation state of +6.