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Oxygen
Methane
Hydrogen
Carbon dioxide
Which of the following is always found in a free state in nature?
Which of the following is an air-borne disease?
Which of the following is an ore of iron?
Which of the following is biodegradable?
Which of the following is called the complete food ?
Which of the following is chief source of Napthalene ?
Which of the following is incorrect regarding the first law of thermodynamics?
Which of the following is most inclusive category of classification among others?
Which of the following is not a chemical change?
Which of the following is not a feature of organisms in the class Mammalia ?