Yes, oxygen can be present in water, but it is not an ion. In a glass of water, the most common ions found are hydroxide ions (OH-) and hydrogen ions (H+). These ions result from the dissociation of water molecules. Water can also contain other ions such as calcium (Ca2+), magnesium (Mg2+), sodium (Na+), and chloride (Cl-), depending on the source and any impurities present.
No, oxygen is not found as an ion in a glass of water. In a glass of water, the most common ion present is the hydroxide ion (OH-), which forms when water (H2O) dissociates. Water molecules occasionally split apart into hydrogen ions (H+) and hydroxide ions (OH-). These ions can exist independently in the water. So, the correct answer is hydroxide ion (OH-).
