As the $s$-character of the hybrid orbital decreases,the bond angle ...........

In which of the following sets of molecules is the hybridisation of the central atoms different?

An atom in a molecule has electrons in $1s, 2s, 2p, 3s, 3p, 3d$ and $4s$ orbitals. This atom can undergo hybridisations of type

What is the hybridisation of $Be$ in $BeF_2$ molecule?

Predict the hybridization of each carbon in the molecule of the organic compound given below. Also,indicate the total number of sigma $(\sigma)$ and pi $(\pi)$ bonds in this molecule.
$HC \equiv C-CO-CH_2-COOH$

What is $sp^{2}$ hybridization? Give its characteristics.