Practical Chemistry in Nut Shell - III
in BITSAT, Cbse Boards, IIT-JEE, Inorganic chemistry on Monday, May 18, 2009
Some Important Observations During Qualitative Analysis
1. Residue and Its Colour
S. No. | Colour | Residue |
| i) | Yellow (hot) and white (cold) | ZnO |
| ii) | Reddish brown (hot) and yellow (cold) | PbO |
| iii) | Black (hot) and Red (cold) | HgO, Pb3O4 |
| iv) | Black (hot) and Red brown (cold) | Fe2O3 |
2. Gases
S. No. | Nature | Gases |
| i) | Colourless and odourless gases | O2, CO2, N2 |
| ii) | Colourless gases with odour | NH3, SO2, HCl, H2S |
| iii) | Coloured gases | NO2 (brown), Br2, (reddish brown), I2 (violet) Cl2(greenish yellow) |
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