The correct answer is D. Valence
Reactants on the left and products on the right
1st qn - B
2nd qn - A
Last qn - Yes
Polyatomic ion: a covalently bonded group of atoms that has a positive or negative charge and acts as a unit.
Explanation:
Water molecules are polar, so they form hydrogen bonds. This is a unique property of water. Water has an unique boiling point and high polarity.
