Answers:
(i) The reaction that joins two monomers to form a polymer is known as a dehydration reaction.
(ii) The molecule of water formed is due to the interaction between Hydroxide ion and a hydrogen ion.
Explanation:
(i) Dehydration means the removal / elimination of water molecules in a particular reactions. For example, when amino acids are reacted they form a polypeptide chain with the elimination of water molecules. Such reactions are also called as condensation reactions.
n H₂N-RHC-COOH → H₂N-[RHC-CO-NH-RHC]n-COOH + n H₂O
(ii) Water molecule has a chemical formula of H₂O. In statement we are given with hydrogen ion (i.e. H⁺) So, we are in need of the counter part which is OH, also the OH should contain a negative charge i.e. OH⁻. Hence, OH⁻ (Hydroxide Ion) will react with H⁺ to form water i.e.
OH⁻ + H⁺ → H₂O
