The D-and F-Block ElementsClass 12 Chemistry Assertion & Reason Questions

Assertion (A): Transition metals have high melting points and boiling points.

Reason (R): The high melting points are due to the involvement of a greater number of electrons from (n-1)d in addition to the ns electrons in the interatomic metallic bonding.

Assertion (A): Zinc, cadmium, and mercury are not regarded as transition metals.

Reason (R): These elements have a completely filled d-subshell in their ground state but an incompletely filled d-subshell in one of their common oxidation states.

Assertion (A): The atomic radii of Zirconium (Zr) and Hafnium (Hf) are almost identical.

Reason (R): Both Zirconium and Hafnium belong to the same group (Group 4) of the periodic table.