• Rajarshi Ghosh

      Articles written in Resonance – Journal of Science Education

    • Molecule of the Month: Mercurous Nitrite

      Rajarshi Ghosh

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    • Priyadaranjan Ray: Contributions to Chemical Science

      Rajarshi Ghosh

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      Prof. Priyadaranjan Ray’s contribution to inorganic chemistry and related disciplines is enormous. His work on the elucidation of valency and structure of coordination compounds through magnetic measurements, proposition of Ray–Dutt twist mechanism and the discovery of inner metallic complexes of higher than second-order made him internationally famous. He first reported the two ligand isomers of thiosulphate ion and designed several organic reagents for the detection and estimation of metal ions. Stabilization of unusual oxidation state of metal ions through coordination with suitable ligand was also his important work. Besides science, he was interested in its history. Scientific activities as well as a brief life-sketch of this Indian stalwart of science is summarized in this present endeavour.

    • Discovery of Room Temperature Ionic Liquid: P C Ray versus P Walden

      Rajarshi Ghosh

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      As per literature review, henceforth, Sir P C Ray and his coauthor (J N Rakshit) of that very particular synthesis of the ionic compound which was liquid at room temperature should be regarded as the discoverer of room temperature ionic liquid.

    • Ghosh’s Law: A Retrospection

      Rajarshi Ghosh

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      The first organized theory of strong electrolytes was proposed by the Indian scientist Jnan Chandra Ghosh (J C Ghosh) in 1918. As soon as it appeared, it was highly appreciated throughout the globe. However, from 1919 several scientific papers appeared, which criticized this theory. The publication of Debye–Huckel limiting law in 1923 initially subsided Ghosh’s theory. But interestingly, the theory started to regain its importance since the middle of the last century when some important results were published by scientists from India and abroad.

    • Upper Limit of the Periodic Table and the Future Superheavy Elements

      Rajarshi Ghosh

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      Controversy surrounds the isolation and stability of the future transactinoid elements (after oganesson) in the periodic table. A single conclusion has not yet been drawn for the highest possible atomic number, though there are several theoretical as well as experimental results regarding this. In this article, the scientific backgrounds of those upcoming super-heavy elements (SHE) and their proposed electronic characters are briefly described.

    • Controversy on Position Reversal of Four Element Pairs in the Periodic Table

      Rajarshi Ghosh

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      In the periodic table of chemical elements, there was a contro-versy on the position of four element pairs—tellurium-iodine, cobalt-nickel, argon-potassium, and thorium-protactinium—where higher atomic weight species were placed just before the lower, i.e., the positions of these pairs of elements were reversed. The proper justification of this position reversal appeared after the publication of Moseley’s work in 1913 when periodicity was redefined as the function of atomic number, not the atomic weight. This controversy surrounding the housing of these four pairs of chemical elements according to their atomic weights, which spanned for more than forty years, and its ultimate solution are briefly delineated in this article.

    • Determination of Molecular Formula of Potassium Tris(oxalato)ferrate(III) Trihydrate

      Rajarshi Ghosh

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      The molecular formula of potassium tris(oxalato)ferrate(III)trihydrate has been derived by analyzing its different chemicalcomponents by volumetric analysis and finally using thedata in mole ratio method. The experiment presented here issimple, cost-effective, and student-friendly.

    • The Bunsen Burner

      Rajarshi Ghosh

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      The Bunsen burner was designed by Robert W. E. Bunsen in Germany more than 150 years back. By controlling the mixing of aerial oxygen with the fuel (hydrocarbons, nitrogen oxide, biogas, etc.) or fuel mixture, Bunsen burners can produce either oxidizing or reducing flames. The temperature of the Bunsen burner flame is different in different zones. This burner is mandatory for qualitatively detecting various inorganic and organic samples through the flame test and Lassaigne's test, respectively. Application of the Bunsen burner extends to atomic absorption spectroscopy and atomic emission spectrometry.

    • Bose–Stoner Formula in Magnetochemistry

      Rajarshi Ghosh

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      The spin-only magnetic moment formula, widely used for calculating the magnetic moment of some particular metal complexes, was developed by Debendra Mohan Bose, one of the pioneering physicists of the early twentieth century in India.The formula later became popular as the ‘Bose–Stoner formula’ as Edmund C. Stoner provided some theoretical explanations of its origin.

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