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22/05/2020

Solution (विलयन) for class XII - Part 1

Helpful for class XII students and NEET / JEE and other competition

28/03/2017

Silica gel is a granular, vitreous, porous form of silicon dioxide made synthetically from sodium silicate. Silica gel contains a nano-porous silica micro-structure, suspended inside a liquid. Most applications of silica gel require it to be dried, in which case it is called silica xerogel. For practical purposes, silica gel is often interchangeable with silica

Silica gel is most commonly encountered in everyday life as beads in a small (typically 2 x 3 cm) paper packet. In this form, it is used as a desiccant to control local humidity to avoid spoilage or degradation of some goods. Because silica gel can have added chemical indicators (see below) and absorbs moisture very well, silica gel packets usually bear warnings for the user not to eat the contents.

10/02/2015

GLACIAL ACETIC ACID is a name for water-free
( anhydrous ) acetic acid. Similar to the
German name Eisessig ( ice-vinegar ), the name
comes from the ice-like crystals that form
slightly below room temperature at 16.6 °C
(61.9 °F) (the presence of 0.1% water lowers
its melting point by 0.2 °C).

01/05/2013

29/04/2013

John Dalton FRS (6 September 1766 – 27 July 1844) was an English chemist, meteorologist and physicist. He is best known for his pioneering work in the development of modern atomic theory, and his research into colour blindness.....