Number of $S-S$ bonds in $H_2S_nO_6$ 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 $XeF_4$.

The structure of $B_3N_3H_6$ (borazine) is as follows. How many derivative structures of $B_3N_3H_4X_2$ can be derived from the basic structure by the replacement of two hydrogen atoms?

The number of $\sigma$ and $\pi$ bonds in peroxodisulphuric acid are,respectively

Arrange the bonds in order of increasing ionic character in the molecules: $LiF, K_2O, N_2, SO_2$ and $ClF_3$.

Which of the following contains both covalent and ionic bonds?