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.

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.

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.

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 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.

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.