Saved Bookmarks
| 1. |
Explain the physical and chemical properties of dioxygen. |
|
Answer» Solution :Physical properties : Dioxygen is a colourless and ODOURLESS gas. The water solubility is `3.08 cm^3` per 100 `cm_3` water at 293 K which is just sufficient for the vital support of marine and aquatic life. It has three stable isotopes : 160, 170 180. It liquefies at 90 K and freezes at 55 K. Molecular oxygen, (`O_(2)`) is paramagnetic due to presence of unpaired electrons in `pi^(*)`orbitals. (B) Chemical properties : (i) Reaction with metals : Dioxygen directly reacts with nearly all metals and except Au and PT to form oxides. For example : `2Ca + O_(2) to 2CaO` `4AL + 3O_(2) to 2Al_(2)O_(3)` `4Fe + 3O_(2) to 2Fe_(2)O_(3)` (ii) Reaction with non-metals `C + O_(2) to CO_(2)` `P_(4) + 5O_(2) to P_(4)O_(10)` (iii) Reaction with compounds: `2ZnS + 3O_(2) to 2ZnO + 2SO_(2)` `CH_(4) + 2O_(2) to CO_(2) + 2H_(2)O` Catalytic oxidation - `2SO_(2) + O_(2) overset(V_(2)O_(5)) to 2SO_(3)` `4HCl + O_(2) overset(CuCl_(2))to 2Cl_(2) + 2H_(2)O` |
|