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Question: 1 / 400

What is the main cause of Acid rain?

a. A type of Protozoan that has no permanent shape

b. Positive electrode of an electrolytic cell

c. Homogenous mixture composed of two or more metals

d. Industrial gas emissions combining with water

The main cause of acid rain is the combination of industrial gas emissions, particularly sulfur dioxide (SO2) and nitrogen oxides (NOx), with water vapor in the atmosphere. When these gases are released from sources such as factories, power plants, and vehicles, they can react with water molecules, oxygen, and other chemicals to form sulfuric and nitric acids. These acids then mix with rainwater, resulting in acid rain, which can negatively impact ecosystems, damage buildings, and harm human health.

The other choices do not relate to the formation of acid rain. Protozoans and their shapes are irrelevant in this context, as are the components and functions of electrolytic cells, and the characteristics of metal mixtures. Therefore, they do not contribute to the understanding of acid rain’s causative factors.

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