Question

Question was provided via image upload.

Explanation:

Step1: Balance & classify Q19

$\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}$ (Acid-Base Neutralization)

Step2: Balance & classify Q20

$\ce{Na2CO3 + 2HCl -> 2NaCl + H2O + CO2}$ (Double Displacement, Gas Evolution)

Step3: Balance & classify Q21

$\ce{NH4NO2 -> N2 + 2H2O}$ (Decomposition)

Step4: Balance & classify Q22

$\ce{4Na + O2 -> 2Na2O}$ (Combination)

Step5: Balance & classify Q23

$\ce{MgCO3 -> MgO + CO2}$ (Decomposition)

Step6: Balance & classify Q24

$\ce{2KBr + Cl2 -> 2KCl + Br2}$ (Single Displacement)

Step7: Balance & classify Q25

$\ce{Zn + CuSO4 -> Cu + ZnSO4}$ (Single Displacement)

Step8: Balance & classify Q26

$\ce{4P + 5O2 -> P4O10}$ (Combination)

Step9: Balance & classify Q27

$\ce{SrBr2 + (NH4)2CO3 -> SrCO3 + 2NH4Br}$ (Double Displacement)

Step10: Balance & classify Q28

$\ce{2AgNO3 + (NH4)2CrO4 -> Ag2CrO4 + 2NH4NO3}$ (Double Displacement)

Step11: Balance & classify Q29

$\ce{2K + 2H2O -> 2KOH + H2}$ (Single Displacement)

Step12: Balance & classify Q30

$\ce{2Al + 3Pb(NO3)2 -> 2Al(NO3)3 + 3Pb}$ (Single Displacement)

Step13: Balance & classify Q31

$\ce{3Fe + 2O2 -> Fe3O4}$ (Combination)

Step14: Balance & classify Q32

$\ce{4Li + O2 -> 2Li2O}$ (Combination)

Step15: Balance & classify Q33

$\ce{ZnCl2 + 2KOH -> Zn(OH)2 + 2KCl}$ (Double Displacement, Precipitation)

Step16: Balance & classify Q34

$\ce{Fe2O3 + 3H2 -> 2Fe + 3H2O}$ (Single Displacement, Redox)

Step17: Balance & classify Q35

$\ce{2Pb(NO3)2 -> 2PbO + 4NO2 + O2}$ (Decomposition)

Step18: Balance & classify Q36

$\ce{2H2O -> 2H2 + O2}$ (Decomposition)

Step19: Balance & classify Q37

$\ce{3Mg + N2 -> Mg3N2}$ (Combination)

Answer:

1. $\ce{Mg(OH)2 + 2HCl -> MgCl2 + 2H2O}$; Acid-Base Neutralization
2. $\ce{Na2CO3 + 2HCl -> 2NaCl + H2O + CO2}$; Double Displacement (Gas Evolution)
3. $\ce{NH4NO2 -> N2 + 2H2O}$; Decomposition
4. $\ce{4Na + O2 -> 2Na2O}$; Combination
5. $\ce{MgCO3 -> MgO + CO2}$; Decomposition
6. $\ce{2KBr + Cl2 -> 2KCl + Br2}$; Single Displacement
7. $\ce{Zn + CuSO4 -> Cu + ZnSO4}$; Single Displacement
8. $\ce{4P + 5O2 -> P4O10}$; Combination
9. $\ce{SrBr2 + (NH4)2CO3 -> SrCO3 + 2NH4Br}$; Double Displacement
10. $\ce{2AgNO3 + (NH4)2CrO4 -> Ag2CrO4 + 2NH4NO3}$; Double Displacement
11. $\ce{2K + 2H2O -> 2KOH + H2}$; Single Displacement
12. $\ce{2Al + 3Pb(NO3)2 -> 2Al(NO3)3 + 3Pb}$; Single Displacement
13. $\ce{3Fe + 2O2 -> Fe3O4}$; Combination
14. $\ce{4Li + O2 -> 2Li2O}$; Combination
15. $\ce{ZnCl2 + 2KOH -> Zn(OH)2 + 2KCl}$; Double Displacement (Precipitation)
16. $\ce{Fe2O3 + 3H2 -> 2Fe + 3H2O}$; Single Displacement (Redox)
17. $\ce{2Pb(NO3)2 -> 2PbO + 4NO2 + O2}$; Decomposition
18. $\ce{2H2O -> 2H2 + O2}$; Decomposition
19. $\ce{3Mg + N2 -> Mg3N2}$; Combination