IBA (Institute Of Business Administration) Entry Test

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French physicist Charles Fabry found ozone gas in the atmosphere in 1913. At room temperature, ozone is a colorless gas; it condenses to a dark blue liquid at -170 F. At temperatures above the boiling point of water, 212 F, it decomposes. Ozone is all around us. After a thunderstorm, or around electrical equipment, ozone is often detected as a sharp odor. Ozone is used as a strong oxidizing agent, a bleaching agent, and to sterilize drinking water. This gas is also highly reactive. For example, rubber insulation around a car's spark plug wires will need to be replaced eventually, due to the small amounts of ozone produced when electricity flows from the engine to the plug. The passage implies that:

Ozone is the result of pollution. High ozone levels in the atmosphere will cause large numbers of people to buy new car batteries. Ozone has no practical uses. Ozone is a natural part of the Earth's atmosphere.

Correct Answer:

Ozone is a natural part of the Earth's atmosphere.

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