Which of the following pairs has the same bond angle?

Consider the species $NO_3^-$,$NO_2^+$,and $NO_2^-$. Pick the correct statement:

The highest amount of $s-$character is observed in

With which of the given pairs does $CO_2$ resemble in terms of structure?

Which of the following molecules is linear?

In the formation of a certain compound,the central atom uses its hybrid orbitals and has a bond angle around it of $105^o$. The percentage of $s-$ character in the hybrid orbitals is likely to be