Locate the polyatomic ion in the compound KNO3

Polyatomic ion is potassium nitrate is nitrate ion .

Explanation:

Polyatomic ions are those species of ions with more than one atom of an same element or different elements .

For example : sulfate ions, bicarbonate ion etc.

In the given compound ,

Cation is potassium ion =  

Anion is nitrate ion =

Polyatomic ion is potassium nitrate is nitrate ion .This is because nitrate ions has single atom of nitrogen and three atoms of oxygen along with charge of single negative unit.

h let me think

vanderwaal's forces of attraction are the electrostatic intermolecular forces that exist in a molecule due to the temporary or permanent dipoles that are developed in a molecule. in , the major intermolecular forces are dipole-dipole interactions as the molecule is polar (bent structure). so the vanderwaal's forces of interaction in between molecules are the permanent dipole-dipole interactions that develop due to the dipole that exists in between the polar h - s bond. the positively charged hydrogen atom is attracted towards the negative end of the dipole that is sulfur of the adjacent molecule. therefore, these forces of attraction are relatively stronger than that of london dispersion forces that exist in non polar molecules.