Chemical formulae

_{What is the chemical formula for sodium chloride?}

• NaCl

• Na₂Cl

• NaCl₂

• Na₂C

_{What is the chemical formula for potassium nitrate?}

• KNO₃

• KNO

• K₂NO₃

• K₂N

_{What is the chemical formula for magnesium oxide?}

• MgO

• Mg₂O

• MgO₂

• Mg₂O₂

_{What is the chemical formula for helium?}

• He

• He₂

• H₂

• He²⁺

_{What is the chemical formula for iron(II) oxide?}

• FeO

• Fe₂O

• FeO₂

• Fe₂O₂

_{What is the chemical formula for copper(II) sulfate?}

• CuSO₄

• Cu₂SO₄

• CuS

• Cu(SO₄)₂

_{What is the chemical formula for nitrogen dioxide?}

• NO₂

• NO₃

• N₂O₂

• N₂O₃

_{What is the chemical formula for carbon dioxide?}

• CO₂

• CO

• C₂O₂

• C₂O

_{What is the chemical formula for sulfuric acid?}

• H₂SO₄

• HSO₃

• H₂SO₃

• SO₄

_{What is the chemical formula for water?}

• H₂O

• HO

• H₂O₂

• H₂OH