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 These question papers will surely help the student appearing for the ASERB exam (non-technical) Chemistry - 2025 and will give an idea about the exam. This question paper was from the DTE 2023 non-technical exam chemistry.  Youtube link:  https://youtu.be/5f4sc8rVcIk LECTURER (NON-TECHNICAL) CHEMISTRY, 2023, Assam

Assignment-Inorganic Chemistry   MACROCYCLES AND AFFINITY OF METAL IONS  TOWARDS MACROCYCLES A macrocycle is defined as a cyclic compound with nine or more members including at least three donor atoms.  Macrocycles are special types of polydentate ligands in which the ligating atoms are constrained in a large ring encircling the metal atom. Macrocycles are important and powerful ligands, ubiquitous in transition metal coordination chemistry for the following reasons:   1) They mimic important biological ligands developed long ago by nature, for example the porphyrin prosthetic group of many metalloproteins.   2) They impart thermodynamic and kinetic stabilities to their metal complexes uncommon or non-existent with ligands of lessor types. Macrocycles can be classified as, a.        Polyaza Macrocycles b.          Polythia, Polyphospha, and Polyarsa Macrocycles c       ...

UV- Visible Spectroscopy         Fig: UV- Visible Spectrophotometer Content Introduction Instrumentation Working Principle Operating Process Application Introduction:   Spectroscopy is  the interaction of  electromagnetic radiation with matter. When light is absorbed by matter, this results an increase in the energy of the atoms or molecules. Ø   In UV-Vis spectroscopy, the UV-Vis light is passed through a sample and the transmittance(T) of light by a sample is measured. Ø   Most organic molecules with or without functional groups are transparent in the portions of the electromagnetic spectrum that we call the ultraviolet (UV) and visible (VIS) regions. Ø   Wavelength in this region ranges from 200 nm to 800 nm (for UV 200 nm – 400 nm and for Visible region 400 nm-800 nm)  Instrumentation:   Light source Ø   Tungsten filament lamps emit the radiations of 375 nm. Ø   The intensity of Hydrogen-De...

Organic Chemistry (M)