This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Biochemistry
[{'content': 'The presence of 2 extra pairs of electrons on the oxygen in water molecule results in- \nSelect and explain. \nA. Makes water a non-polar solvent, B. Forms covalent bonds in the ice., C. Electronegative charge on water molecule, D. Electropositive charge on water molecule', 'role': 'user'}, {'content': 'Answer: C \nExplanation: Though water molecule appears to be neutral, it is an electric dipole, i.e. have both positive and negative charges on the same molecule.\nThe electric dipolar nature of the water molecule is due to its structure which consists of two hydrogen atoms linked covalently to an oxygen atom.\nEach of the hydrogen atom shares a pair of electrons with the oxygen atom.\nOxygen has a strong electron - withdrawing tendency and therefore it pulls shared electrons away from the hydrogen nuclei to lie more towards oxygen. Consequently, hydrogen atom acquires a localized partial positive charge.\nOxygen has two more pairs of electrons which remain unshared. These electrons impart a partial negative charge to oxygen.', 'role': 'assistant'}]