Which are identical ?

Choose the pair physical quantities which have identical dimensions

pair of orbitals which have identical orientation and common nodal plane (s) :

Choose the pair physical quantities which have identical dimensions

Find the number of geometrical isomer of Ma_(2)bcde which have identical ligands at maximum distance. (a, b, c, d and e are monodentate ligand)

Find the number of ways in which five identical balls can be distributed among ten identical boxes, if not more than one can go into a box.

Find the number of ways in which five identical balls can be distributed among ten boxes, if not more than one can go into a box.

Which pair is identical ?