Question

a base is an electrolyte that releases ions that combine with hydrogen ions.
a true
b false

question 6
a complex carbohydrate consists of a phosphate group attached to a sugar molecule.
a true
b false

Explanation:

First Question (About Base Definition)

A base (in the Bronsted - Lowry or Arrhenius sense) can be considered an electrolyte. Arrhenius bases release hydroxide ions ($OH^-$) in solution, and Bronsted - Lowry bases are proton ($H^+$) acceptors. The ions released by a base (like $OH^-$) can combine with hydrogen ions ($H^+$) to form water ($H_2O$). So the statement "A base is an electrolyte that releases ions that combine with hydrogen ions" is correct.

A complex carbohydrate (like polysaccharides) is made up of multiple sugar (monosaccharide) units linked together. A phosphate group attached to a sugar molecule is more characteristic of a nucleotide (the building block of nucleic acids) rather than a complex carbohydrate. So the statement "A complex carbohydrate consists of a phosphate group attached to a sugar molecule" is false.

Answer:

A. True

Second Question (About Complex Carbohydrate)