What do the following abbreviations stand for ?
(i) O
(ii) 2O
(iii) O₂
(iv) 3O₂

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Solution

(i) O stands for an atom of oxygen.
(ii) 2O refers to two atoms of oxygen which are not chemically bonded.
(iii) O₂refers to a molecule of oxygen in which atoms are chemically bonded to give a molecule of oxygen gas.
(iv) 3O₂ refers to three molecules of oxygen.

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