The correct answer is:
d) Dióxido de carbono
Explanation:
1. Agua y aceite: This is an example of a heterogeneous mixture where water and oil do not mix together.
2. Limonada: This is a mixture of water, lemon juice, and sugar, making it a homogeneous mixture.
3. Sal y agua: When salt is dissolved in water, it forms a homogeneous mixture.
4. Dióxido de carbono: Carbon dioxide (CO2) is a compound, not a mixture. It is a pure substance consisting of two different elements, carbon, and oxygen, chemically bonded together.
Therefore, dióxido de carbono is not an example of a mixture as it is a pure substance.
