This blog provides information related to chemistry for various entrance exams i.e., IIT JEE (Mains and Advanced), NEET, CET, KVPY, BITSAT so on
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Coronavirus: How hand sanitisers protect against infections
As coronavirus continues its spread, panic-buying has swept store shelves of hand sanitisers. What's in these sanitizers and how effective are they in comparison to hand washing? This graphic takes a look.
Introduction In normal life we rarely come across pure substances. Most of these are mixtures containing two or more pure substances. Their utility or importance in life depends on their composition. For example, the properties of Brass (mixture of Cu and Zn) are quite different from those of German silver (mixture of Cu, Zn and Ni) or Bronze (mixture of Cu and Sn); 1 ppm of Fluoride ions in water prevents tooth decay, while 1.5 ppm causes the tooth to become mottled and high concentrations of fluorides ions can be poisonous (for example, sodium fluoride is used in rat poison); intravenous injections are always dissolved in water containing salts at particular ionic concentrations that match with blood plasma concentrations and so on. Solution - What does it mean? A true solution is defined as a perfectly homogeneous mixture of two or more substances (called as components) having uniform properties throughout and the composition of which may vary within limits. The su...
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