The trigonal bipyramidal geometry results from the hybridization:

If the dipole moment of an $MX_3$ molecule is zero,then the orbitals used by $M$ $(atomic\ number < 21)$ in sigma bonding are ....

In methane,the bond angle is $......^o$.

The state of hybridisation of $B$ in $BCl_3$ is

Which of the following statements is correct in the context of the allene molecule,$C_3H_4$?

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