Which chemical equation is unbalanced? A). C+O,, CO,
B). Sr t+ O2 2SFO
C). 6H, + 30, 6H, O
D). H, +H, +O,-→ H,0 + H, O

The options in this question are unclear, the clear options are as follows:

A. C + O2 → CO2

B. Sr + O2 → 2SrO

C. 6H2 + 3O2 → 6H2O

D. H2 + H2 + O2 → H2O + H2O

The answer is B

Explanation:

A balanced chemical equation is that equation in which atoms of each elements in the reaction are of equal number on both sides of the equation (product and reactant). To balance a chemical equation, coefficients are used.

In this question, four chemical equations are given as follows:

- C + O2 → CO2

In this equation, atoms of carbon (1) and oxygen (2) are the same on both sides, hence, it is BALANCED.

- Sr + O2 → 2SrO

In this equation, Sr has 1 atom on the reactant side but 2 atoms on the product side. Hence, it is UNBALANCED. The balanced equation will be: 2Sr + O2 → 2SrO

- 6H2 + 3O2 → 6H2O

In this equation, atoms of hydrogen (12) and oxygen (6) are the same on both sides, hence, it is BALANCED.

- H2 + H2 + O2 → H2O + H2O

In this equation, atoms of hydrogen (4) and oxygen (2) are the same on both sides, hence, it is BALANCED.