Which of the following will be octahedral?

What is the bond angle observed in the $H-C-H$ bond of ethane (in $^{\circ}$)?

In $NO_2$ molecule,the $N$ atom undergoes which type of hybridization?

Which of the following pairs of species have the same structure?

In which of the following reactions is there no change in the hybridisation of the central atom?

Describe hybridization in the case of $PCl_5$ and $SF_6$. The axial bonds are longer as compared to equatorial bonds in $PCl_5$ whereas in $SF_6$ both axial bonds and equatorial bonds have the same bond length. Explain.