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 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 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)
1. Residue and Its Colour
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