Which of the following statements are true? i. the electrons in each molecule tend to be attracted to the most electronegative element. ii. each molecular drawing follows the localized electron model. iii. both hf and co2 are linear molecules and therefore nonpolar. iv. the bond angles of nh3 are slightly less than 109.5o because the lone pair compresses the angles between the bonding pairs.

The correct statements are 1 The electrons in each molecule tend to be attracted to the most electronegative element. and 4 The bond angles of NH3 are slightly less than 109.5° because the lone pair compresses the angles betwen the bonding pairs.

Explanation:

The electronegative atom in a covalent bond has a tendency to attract the bonding electron pairs towards itself and generate polarity within that covalent bond.

     The lone pair of electron that is present in the nitrogen atom undergo repulsion with the bond pair electrons  in NH3 thus compressing the bond angles between the bonding pairs.