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Chemistry

Preparation of hydrogen
[General Methods]		  
Reactions of active metals - cold water  
1. PotassiumK + H2O ⟶ …………… + …………… [g]
2. SodiumNa + H2O ⟶ …………… + …………… [g]
3. CalciumCa + H2O ⟶ …………… + …………… [g]
Reaction of metals with steam  
4. MagnesiumMg + H2O ⟶ …………… + …………… [g]
5. AluminiumAl + H2O ⟶ …………… + …………… [g]
6. ZincZn + H2O ⟶ …………… + …………… [g]
7. IronFe + H2O ⇌ …………… + …………… [g]
Reactions of metals with dilute acids  
8. MagnesiumMg + HCl ⟶ …………… + …………… [g]
9. AluminiumAl + H2SO4 ⟶ …………… + …………… [g]
10. ZincZn + HCl ⟶ …………… + …………… [g]
11. IronFe + HCl ⟶ …………… + …………… [g]
Reactions of metals - alkali [conc. soln.]  
12. ZincZn + NaOH ⟶ …………… + …………… [g]
Zn + KOH ⟶ …………… + …………… [g]
13. LeadPb + NaOH ⟶ …………… + …………… [g]
14. AluminiumAl + NaOH + H2O ⟶ …………… + …………… [g]
Al + KOH + H2O ⟶ …………… + …………… [g]

Hydrogen

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Answer

Preparation of hydrogen
[General Methods]		  
Reactions of active metals - cold water  
1. Potassium2K + 2H2O ⟶ 2KOH + H2 [g]
2. Sodium2Na + 2H2O ⟶ 2NaOH + H2 [g]
3. CalciumCa + 2H2O ⟶ Ca(OH)2 + H2 [g]
Reaction of metals with steam  
4. MagnesiumMg + H2O ⟶ MgO + H2 [g]
5. Aluminium2Al + 3H2O ⟶ Al2O3 + 3H2 [g]
6. ZincZn + H2O ⟶ ZnO + H2 [g]
7. Iron3Fe + 4H2O ⇌ Fe3O4 + 4H2 [g]
Reactions of metals with dilute acids  
8. MagnesiumMg + 2HCl⟶ MgCl2 + H2 [g]
9. Aluminium2Al + 3H2SO4 ⟶ Al2(SO4)3 + 3H2 [g]
10. ZincZn + H2SO4 ⟶ ZnSO4 + H2 [g]
11. IronFe + 2HCl ⟶ FeCl2 + H2 [g]
Reactions of metals - alkali [conc. soln.]  
12. ZincZn + 2NaOH ⟶ Na2ZnO2 + H2 [g]
Zn + 2KOH ⟶ K2ZnO2 + H2 [g]
13. LeadPb + 2NaOH ⟶ Na2PbO2 + H2 [g]
14. Aluminium2Al+ 2NaOH + 2H2O ⟶ 2NaAlO2 + 3H2 [g]
2Al + 2KOH + 2H2O ⟶ 2KAlO2 + 3H2 [g]

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