Select the examples in which the formula for the ionic compound is not written correctly or cannot exist as written. I. (NH₄) ₂As
II. CuO
III. Mg(C₂H₃O) ₂
IV. Na₃(HCO₃) ₂

Question

Select the examples in which the formula for the ionic compound is not written correctly or cannot exist as written. I. (NH₄)₂As II. CuO III. Mg(C₂H₃O)₂ IV. Na₃(HCO₃)₂

Quizplus · Accepted Answer

I. (NH₄)₂As is incorrect because arsenic typically forms covalent compounds, not ionic ones with ammonium. IV. Na₃(HCO₃)₂ is incorrect because the charges do not balance; sodium bicarbonate should be NaHCO₃.

Select the Examples in Which the Formula for the Ionic