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Chemistry · Class 12
Atomic emission spectroscopy excites atoms (flame, spark, discharge) so electrons jump up then fall back, emitting light at characteristic wavelengths — line (atomic) spectra. Continuous emission spectra (white light through a prism) show merged rainbow colours without sharp boundaries. Line spectra identify elements: Na yellow flame, Sr red, K violet; discharge tubes give Ne, He, etc. coloured gl
PracticeClass 12 closes applied chemistry: industry makes dyes, pesticides, petrochemicals, polymers, and cosmetics safely; environment tracks air, water, ozone, and green design; analysis proves what products and pollutants contain. Exam hooks: define industrial chemistry; chromophore/auxochrome; nylon-6,6; smog types; acid rain equations; CFC/ozone; BOD/COD; combustion absorbers; IR carbonyl; NMR TMS; M
PracticeClassical combustion is limited to C/H/O formula work. Modern IR finds functional groups; UV-Vis finds conjugation/colour centres; NMR maps hydrogen environments; atomic methods quantify metals; MS gives mass and fragments. Forensic chemistry applies these tools to evidence for reports and courts — analysts need strong analytical background, attention to detail, and problem-solving. Practical scho