Question

1. __ZnS + __HCl → __ZnCl2 + __H2S
2. __HCl + __Cr → __CrCl2 + __H2

3. __Al + __Fe3O4 → __Al2O3 + __Fe

4. __H2 + __Br2 → __HBr

5. __Na2S2O3 + __I2 → __NaI + __Na2S4O6

6. __LaCl3 + __Na2CO3 → __La2(CO3)3 + __NaCl

7. __NH4Cl + __Ba(OH)2 → __BaCl2 + __NH3 + __H2O

8. __Ca(OH)2 + __H3PO4 → __Ca3(PO4)2 + __H2O

9. __C4H10 + __O2 → __CO2 + __H2O

10. __C7H6O2 + __O2 → __CO2 + __H2O

Answer 1

Here are the balanced equations for the given reactions:

1. **ZnS + 2 HCl → ZnCl2 + H2S**

2. **2 HCl + Cr → CrCl2 + H2**

3. **3 Al + Fe3O4 → Al2O3 + 3 Fe**

4. **H2 + Br2 → 2 HBr**

5. **2 Na2S2O3 + I2 → 4 NaI + Na2S4O6**

6. **2 LaCl3 + 3 Na2CO3 → La2(CO3)3 + 6 NaCl**

7. **2 NH4Cl + Ba(OH)2 → BaCl2 + 2 NH3 + 2 H2O**

8. **3 Ca(OH)2 + 2 H3PO4 → Ca3(PO4)2 + 6 H2O**

9. **2 C4H10 + 13 O2 → 8 CO2 + 10 H2O**

10. **2 C7H6O2 + 15 O2 → 14 CO2 + 6 H2O**

These balanced equations ensure conservation of mass, reacting the proper molar ratios of reactants to yield the specified products.