The angle between $sp^2$ orbitals in ethylene is $......^{\circ}$

The hybridisation of $C$ in diamond,graphite and ethyne is in the order

Give the main characteristics of hybridization.

If $p_x$ and $p_y$ orbitals participate in $sp^2$ hybridisation of the sulphur atom in $SO_3$,then the $d$ orbitals which are used in $p\pi-d\pi$ bonds are

Which among the following molecules is $(a)$ involved in $sp^3d$ hybridization,$(b)$ has different bond lengths and $(c)$ has a lone pair of electrons on the central atom?

Which of the following processes involves a change in bond angle along with a change in hybridization?