write the formula of the following salts by criss-cross methods- 1) sodium hydrogen carbonate 2)ferrous sulphate 3) aluminium nitride 4) potassium sulphate 5) ammonium chloride 6) lead nitrate 7) ammonium phosphate 8) cupric oxide 9) calcium hydrogen sulphate10) zine hydroxide.

Dear Student,

1) Sodium Hydrogen carbonate

Symbol    Na    HCO₃
Charge     +1    -1

Formula = NaHCO₃

2) Ferrous sulphate

Symbol    Fe    SO₄
Charge     +2    -2

Formula = FeSO₄

​3) Aluminium nitride

Symbol    Al    N
Charge     +3    -3

Formula = AlN

4) Potassium sulphate

Symbol    K    SO₄
Charge     +1    -2

Formula = K₂SO₄

​5)  ammonium chloride

Symbol    NH₄    Cl    
Charge     +1        -1

Formula = ​NH₄Cl

6) Lead Nitrate

Symbol    Pb    NO₃
Charge     +2    -1

Formula = Pb(NO₃)₂

7) ammonium phosphate

Symbol    NH₄    PO₄
Charge     +1      -3

Formula = ​(NH₄)₃PO₄

​8) Cupric oxide

Symbol    Cu    O
Charge     +2    -2

Formula = ​Cu₂O₂ = CuO

9) Calcium hydrogen sulphate

Symbol    Ca    HSO₄
Charge     +2    -1

Formula = ​Ca(HSO₄)₂

10) Zinc hydroxide

Symbol    Zn    OH
Charge     +2    -1

Formula = ​Zn(OH)₂

Best Wishes !