Final answer:
The chemical equations provided test the concept of balancing chemical reactions. Equation a is not balanced, while equations b and c are balanced. Combustion reactions typically result in the formation of oxides and release of heat, such as the combustion of methane to produce CO2 and H2O. Thus correct option is D
Step-by-step explanation:
The question is asking whether the following chemical equations are balanced:
- a. 2 Hg (l) + O₂(g) → Hg₂O₂ (s)
- b. C₂H₄(g) +2O₂(g) → 2 CO₂(g) + 2 H₂O(g)
- c. Mg(NO3)2 (s) + 2 Li(s) → Mg(s) + 2 LiNO3 (s)
The first equation a is not balanced because the number of oxygen atoms on the reactant side does not equal the number of oxygen atoms on the product side. Equation b is balanced as there are the same number of carbon, hydrogen, and oxygen atoms on both sides of the reaction. Equation c is also balanced, with correct amounts of magnesium, nitrogen, oxygen, and lithium on both sides of the equation.
Generally, combustion reactions involve a substance reacting with oxygen to produce oxides and heat. For example, the combustion of methane is represented by CH4 (g) + 2O2 (g) => CO2 (g) + 2H2O(g). This reaction is a typical combustion reaction where the fuel reacts with oxygen to form carbon dioxide and water. So correct option is D