7G

Mathematics: Easy Trick for multiplying 2-digit numbers You must be knowing the normal trick of multiplication which your teachers taught you. It goes like this:             Ex: 37×77                                                                    4                                           4               ...

Ø The concept of pH was first introduced by the Danish chemist  Søren Peder Lauritz Sørensen  at the Carlsberg Laboratory in 1909 . Ø pH was originally acronym for French clause " pouvoir hydrogène ," which can be translated into the English as "power of hydrogen," or "potential of hydrogen." Ø pH is used to quantify acidic or alkaline nature of a chemical which is measured in terms of H+ ions concentration.

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