Percentage of $s-$character in $sp^3$ hybrid orbital is (in $\%$)

If pure unhybridised orbitals are used in forming $CH_4$ then which statement is incorrect :-

In which hybridization is the bond angle the highest?

In which of the following species,$d$-orbitals having $xz$ and $yz$ two nodal planes involved in hybridization of central atom?

What is the hybridisation state of the central atom and the shape of the conjugate base of the ammonium ion?

Observe the following statements:
Statement-$I$: Hybridisation is not the same in both ${SF}_6$ and ${BrF}_5$.
Statement-$II$: ${BrF}_5$ is square pyramidal while ${SF}_6$ is octahedral in shape.
The correct answer is: