Question

Which option shows a correctly balanced chemical equation?
H₂O ⟶ H₂ + O₂
2Fe₂O₃ + C ⟶ Fe + 3CO₂
FeS + 2HCl ⟶ FeCl₂ + H₂S
2Na₃PO₄ + 3MgCl₂ ⟶ 6NaCl + Mg₃PO₄

Answer 1

To determine which option shows a correctly balanced chemical equation, we need to check each equation for balance. A balanced equation has the same number of each type of atom on both sides of the equation.

1. **H₂O ⟶ H₂ + O₂**
Left side: 2 H, 1 O
Right side: 2 H, 2 O
This equation is **not balanced**.

2. **2Fe₂O₃ + C ⟶ Fe + 3CO₂**
Left side: 4 Fe, 6 O, 1 C
Right side: 1 Fe, 6 O, 3 C
This equation is **not balanced**.

3. **FeS + 2HCl ⟶ FeCl₂ + H₂S**
Left side: 1 Fe, 1 S, 2 Cl, 2 H
Right side: 1 Fe, 2 Cl, 1 S, 2 H
This equation is **balanced**.

4. **2Na₃PO₄ + 3MgCl₂ ⟶ 6NaCl + Mg₃PO₄**
Left side: 6 Na, 2 P, 8 O, 6 Cl, 3 Mg
Right side: 6 Na, 1 P, 4 O, 6 Cl, 3 Mg
This equation is **not balanced**.

The only correctly balanced equation from the options provided is:
**FeS + 2HCl ⟶ FeCl₂ + H₂S**.