Which of the following cannot exist in solution_________________?
Correct answer: A. O-2
- A. O-2
- B. H+
- C. Cl-
- D. Na+
Explanation
The oxide ion, O-2, cannot remain in aqueous solution because it reacts immediately with water: O-2 + H2O forms OH- ions. The likely mistake is H+, but in water H+ is present mainly as hydronium, H3O+, whereas Na+ and Cl- can remain as hydrated ions.
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About Reactions of Group II Elements
Group II reactions cover the behaviour of beryllium, magnesium, calcium, strontium and barium with water, oxygen, halogens, acids and nitrogen. The trends in reactivity, hydroxide solubility and basicity, along with the thermal decomposition of carbonates and nitrates, depend on increasing atomic size down the group.
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