VITEEE 2012 Paper

In NO3− ,
H =

1

2

[5 + 0 - 0 + 1] = 3 , So, sp3 hybridization.
Thus, it has trigonal planar geometry.

In H3O+ ,
H =

1

2

[6 + 3 - 1 + 10] = 4; So, sp3
hybridization and it has pyramidal geometry due to the presence of one lone pair of electrons.