State whether the following statement is 'true' or 'false'. If false write the correct statement.

Air is a mixture not a compound since the components of air - cannot be separated by physical methods.

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Nitrogen of the air to nitric oxide.

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Nitric oxide to nitrogen dioxide.

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Nitrogen dioxide to nitric acid.

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Nitric acid to soluble nitrates in the soil.

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Carbon dioxide in air to carbohydrates in plants.