Question

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.

Answer 1

1. Valency of sodium- 1+
valency of HCO3- 1-

formula- NaHCO3

2. Valency of Fe- 2+
valency of SO4- 2-

formula- FeSO4

3. valency of Al- 3+
valency of N- 3-

formula- AlN

4. valency of K- 1+
valency of SO4- 2-

formula- K2SO4

5. valency of NH4- 1+
valency of CI- 1-

formula- NH4Cl

6. valency of Pb- 2+
valency of NO3- 1-

formula-Pb(NO3)2

7. valency of NH4- 1+
valency of PO4- 3-

formula- (NH4)3PO4

8. valency of Cu- 2+
valency of O- 2-

formula- CuO

9. valency of Ca- 2+
valency of OH- 1-

formula-Ca(OH)2

10. valency of Zn- 2+
valency of OH- 1-

formula- Zn(OH)2

Note: crossing method cannot be shown here.

Answer 2

Explanation:

In this picture I have do the criss cross method.