Answer:
D
Explanation:
A balanced equation has the same number of atoms for each element on both sides of the equation. It is important for chemical equations to be balanced as only then will it show how the reactants and products are related to each other in terms of mole ratio. The reactants are found on the left-hand side of the arrow, while the products are found on the right-hand side.
In this question, the elements are Pb and O.
Let's count the number of atoms of each element in the unbalanced equation.
Reactant
Pb: 1 atom
O: 2 atoms
Product
Pb: 1 atom
O: 3 atoms
The number of Pb atoms are already balanced, but not the for the O atoms. Note that balancing the O atoms also affects the number of Pb atoms.
2 PbO₂ → 2 PbO +O₂
Now, the equation is balanced with 2 Pb atoms and 4 O atoms on both sides.
Thus, option D is correct.
To learn more about balancing chemical equations, check out: https://brainly.com/question/21406528