formula correction for iPad

Each of the formulae shown in the mistakes column has an error in it. Name the compound and write the correct formula in the third
column. The correct answers are written in the fourth column and you can see them if you change the background colour.
Name
Ammonium carbonate
Sodium oxide
Magnesium sulfate
Lithium carbonate
Magnesium hydrogen carbonate
Water
Silver oxide
Sodium nitrate
Lithium chloride
Copper hydroxide
Lead carbonate
Zinc hydroxide
Copper chloride
Barium sulfide
Lithium oxide
Silver carbonate
Potassium hydrogen carbonate
Silver sulfate
Barium carbonate
Mistakes
NHCO3
NaO2
MgS2
LI2CO3
Mg(HCo3)2
H2O
AG2O
NaNO3
Licl
Cu(OH)2
PbCO2
Zn(OH)2
Cu2Cl
baS
Li2O
Ag3CO2
KhCO3
Ag2So4
BaCo3
Your correction
NH4CO3
Correct formula
NH4CO3
Na2O
MgSO4
Li2CO3
Mg(HCO3)2
H2O
Ag2O
NaNO3
LiCl
Cu(OH)2
PbCO3
Zn(OH)2
CuCl2
BaS
Li2O
Ag2CO3
KHCO3
Ag2SO4
BaCO3
Barium nitrate
Calcium nitrate
Lead hydroxide
Iron III oxide
Lithium hydrogen carbonate
Sodium hydrogen carbonate
Silver nitrate
Potassium sulfate
Calcium hydroxide
Potassium oxide
Aluminium hydroxide
Lithium sulfide
Iron II carbonate
Ammonium chloride
Barium hydroxide
lead chloride
Silver hydroxide
Copper sulfide
Sodium chloride
Ba(No3)2
Ca(NO2)3
Pb(OH)2
Fe2o3
LihCO3
NahCO3
AgNO2
K2So4
CaOH2
KO2
Al(OH)3
LiS2
FeCo3
NHCl4
Ba(oH)2
PbCl2
AgOh
Cu2S
NaCL
Ba(NO3)2
Ca(NO3)2
Pb(OH)2
Fe2o3
LihCO3
NaHCO3
AgNO3
K2SO4
Ca(OH)2
K2O
Al(OH)3
Li2S
FeCO3
NH4Cl
Ba(OH)2
PbCl2
AgOH
CuS
NaCl