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Q. Describe about groups or families in periodic table? Every element may be represented by a one or two letter symbol. In the middle of nineteenth century a Russian chemist Dm
what are scales
what is made when resorsinol reacts with zinc powder?
Which of the following electronic configurations is not possible: (1) 1s 2 , 2s 2 (2) 1s 2 , 2s 2 , 2p 6 (3) 3d 10 4s 2 4p 2
Preparation of ethane by lab method
who formulated the laws of chemical combination?
An element has the electronic configuration 1s 2 , 2s 2, 2p 6 , 3s 2 , 3p 2 . Its valency electrons are: (1) 6 (2) 2 (3) 3 (4)4 Ans: 4
What is meant by entropy driven reaction? How can a reaction with positive changes of enthalpy and entropy are made entropy driven
Why nitrate give blue color
what is the difference between mirror image and optical isomerism?
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