Question

2.
20. Write balanced equations for the following word equations :
Potassium nitrite
→Potassium nitrate+ Oxygen
2] Calcium
+ Water
→ Calcium hydroxide + Hydrogen
3] Iron
+ Hydrochloric acid → Iron [II] chloride
+ Hydrogen
4] Nitrogen dioxide
+ Water + Oxygen
→ Nitric acid
15]
5] Lead dioxide [lead (IV) oxide]
→ Lead monoxide
+ Oxygen
6] Aluminium + Oxygen
— Aluminium oxide
7] Iron
+ Chlorine
→ Iron (III) chloride
3
8] Potassium bromide + Chlorine
→ Potassium chloride + Bromine
9] Potassium bicarbonate
→ Potassium carbonate + Water + Carbond
10] Calcium hydroxide + Ammonium chloride → Calcium chloride
+ Water + Ammonia​

Answer 1

1. 2KNO3 + heat ----> 2KNO2+O2

2. Ca + 2H2O ---> Ca(OH)2 + H2

3. Fe + 2HCl ---> FeCl2 + H2

4. 4NO2 + 2H2O + O2 ---> 4HNO3

5. 2PbO2 ---> 2PbO + O2

6. 4Al  +  3O2 → 2Al2O3

7. 2 Fe(s) + 3 Cl2(g) → 2 FeCl3(s) 

8. Cl2 + 2KBr --> 2KCl + Br2.

9. 2KHCO3 + heat ---> K2CO3 + H2O + CO2

10. Ca(OH)2 + 2NH4Cl → CaCl2 + 2NH3 + 2H2O.