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chemistry nepal spectroscopy inorganic atomic physical science analytical instrumentation organic chemical absorption emission reaction metal polymer volumetric metallurgy high school equilibrium mole numerical stoichimetry stoichiometry calcium magnisium alkali sodium potasium properties earth alkaline preparation alkyne alkene alkane electronics mechanism detection formula homologous series iupac nomeclature tu pesticides fertilizers dyes drugs medicine periodic table d block metals heavy bonding geometry molecular analysis market analysis inoic ionic plasma atomic emission spectrophotometry fp photometry flame percentage purity limiting reagent reagent limiting hypothesis avogadros atom