Identify the incorrect statements among the following:
$(i) \ SF_6$ does not react with water
$(ii) \ SF_6$ is $sp^3d$ hybridized
$(iii) \ S_2O_3^{2-}$ is a linear ion
$(iv)$ There is no $\pi$-bonding in $SO_4^{2-}$ ion

The bond having the minimum bond energy is

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 $XeF_4$.

Solid $BeH_2$ and solid $BeCl_2$ differ in

Number of $S-S$ bonds in $H_2S_nO_6$ is:

Compound $X$ is the anhydride of sulphuric acid. The number of $\sigma$-bonds and the number of $\pi$-bonds present in $X$ are,respectively: