Oil or natural gas is considered sour if it has a high percentage of:

hydrogen chloride

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sulphuric acid

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hydrogen sulphide

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chlorine

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Solution

The correct option is A hydrogen sulphide
Hydrogen sulfide gas is found in petroleum and natural gas. Oil or natural gas is considered sour if it has a high percentage of hydrogen sulfide. Natural gas can contain up to 28 percent hydrogen sulfide gas, consequently, it may be an air pollutant near petroleum refineries and in oil and gas extraction areas.

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