Q37 of 203 Page 129

In what form does oxygen gas occur in nature?

Atoms of the majority of elements (except noble gases) are chemically very reactive and does not exist in the free state (as a single atom). Oxygen gas is diatomic and hence its molecular formula is O2.


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What do the following abbreviation stand for?

(a) O (b) 2O (c) O2 (d) 3O2

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In what form do noble gases occur in nature?

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What is the difference between 2H and H2?