State the formula of each of the following compounds.
(a) Calcium nitrate
(b) Sodium chloride
(c) Magnesium sulphate
(d) Ammonium bicarbonate
(e) Aluminium oxide
(a) Calcium nitrate
Symbol Ca NO3
Valency: Ca2+ NO31-
1- 2+
Formula: Ca(NO3)2
(b) Sodium chloride
Symbol Na Cl
Valency: Na2+ Cl2-
2- 2+
Formula: Na2Cl2 = NaCl
(c) Magnesium sulphate
Symbol Mg SO4
Valency: Mg2+ SO42-
2- 2+
Formula: Mg2(SO4)2 = MgSO4
(d) Ammonium bicarbonate
Symbol NH4 HCO3
Valency: NH4+1 HCO31-
1- 1+
Formula: NH4HCO3
(e) Aluminium oxide
Symbol Al O
Valency: Al3+ O2-
2- 3+
Formula: Al2O3
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