5. In which of the following the molecular oxygen is not obtained?
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Explanation:
Model of molecular or diatomic oxygen, composed of two oxygen atoms bonded together. Molecular oxygen (O2) is a diatomic molecule that is composed of two oxygen atoms held together by a covalent bond. Molecular oxygen is essential for life, as it is used for respiration by many organisms.
Oxygen in the form of O2 is produced from water by cyanobacteria, algae and plants during photosynthesis and is used in cellular respiration for all living organisms.
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