Question

a substance that releases hydrogen ions in water is a base.
a true
b false

question 10
an atom that has gained or lost electrons is called an ion.
a true
b false

question 11
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Explanation:

First Question (A substance that releases hydrogen ions in water is a base)

By definition, an acid is a substance that releases hydrogen ions ($H^+$) in water, while a base releases hydroxide ions ($OH^-$) or accepts $H^+$ ions. So the statement is false.

An ion is defined as an atom (or molecule) that has a net electrical charge due to the gain or loss of electrons. If an atom gains electrons, it becomes a negative ion (anion); if it loses electrons, it becomes a positive ion (cation). So the statement is true.

Answer:

B. False

Second Question (An atom that has gained or lost electrons is called an ion)