Question

can you give me a hint by solving one I doesn't know how to do​

Answer 1

• Copper II has a valency of +2
• Iron III has a valency of +3
• Calcium has a valency of +2
• Iron II has a valency of +2
• Potassium has a valency of +1
• Aluminium has a valency of +3
• Magnesium has a valency of +2
• Hydrogen has a valency of +1, when reacts with non metals.

So,

Row 1:

Cu(OH)₂ CuSO₄ Cu(NO₃)₂ Cu(HCO₃)₂

Row 2:

Fe(OH)₃ Fe₂(SO₄)₃ Fe(NO₃)₃ Fe(HCO₃)₃

Row 3:

Ca(OH)₂ CaSO₄ Ca(NO₃)₂ Ca(HCO₃)₂

Row 4:

Fe(OH)₂ FeSO₄ Fe(NO₃)₂ Fe(HCO₃)₂

Row 5:

KOH K₂SO₄ KNO₃ KHCO₃

Row 6:

Al(OH)₃ Al₂(SO₄)₃ Al(NO₃)₃ Al(HCO₃)₃

Row7:

Mg(OH)₂ MgSO₄ Mg(NO₃)₂ Mg(HCO₃)₂

Row 8:

H₂O H₂SO₄ HNO₃ H₂CO₃