End-of-Course Test (Molecular Structure)Remember: to prepare for the unit test, you need to also review notes, practice, and the associated material in your text book.Part I. Multiple ChoiceIdentify the letter of the choice that best completes the statement or answers the question.Part II. Short Answer3 Draw a Lewis structure for the ammonium ion, NH4+. Show all work. What shape is this molecule? Show the dipoles - is this molecule polar or nonpolar?Part III. Applying Valence Bond Theory to Predict H2CO Molecular Structure