What are the different types of bonds formed by sulphur with oxygen in thiosulfuric acid $(H_2S_2O_3)$?

Which of the following statements is incorrect?
$(i)$ $NaCl$,being an ionic compound,is a good conductor of electricity in the solid state.
$(ii)$ In canonical structures,there is no difference in the arrangement of atoms.
$(iii)$ Hybrid orbitals form stronger bonds than pure orbitals.
$(iv)$ $VSEPR$ theory can explain the square planar geometry of $XeF_4$.

Total number of compounds / ions which have at least two bond lengths same out of $CO_3^{2-}, HCOOH, S_2O_3^{2-}, NO_2^{-}$

In the following electron-dot structure, calculate the formal charge from left to right for the nitrogen atoms: $: \ddot{N} = N = \ddot{N} :$

In the solid state,$PCl_5$ exists as.......

Select the hybridisation which has non-planar geometry when all are bond pairs,but planar when there are $2$ lone pairs on the central atom: