Reading practice 1

What is the color of nitrogen dioxide gas?

• Blue

• Yellow

• Brown

• Green

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Point4

What does oxidation refer to?

• Combining with hydrogen

• Combining with carbon

• Combining with nitrogen

• Combining with oxygen

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Point1

What is nitric oxide?

• A colorless gas produced from the combination of oxygen and nitrogen gas during fuel burning

• A type of metal

• A type of plant

• A type of animal

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Point3

What is formed when oxygen atoms released from nitrogen dioxide combine with oxygen molecules?

• Carbon dioxide

• Ozone

• Methane

• Hydrogen peroxide

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Point5

What type of pollution is caused by chemical reactions in the air using sunlight?

• Thermal pollution

• Noise pollution

• Photochemical smog

• Water pollution

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Point2