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Following Hund's rule which element contains six unpaired electron:
(1) Fe
(2) Co
(3) Ni
(4) Cr
Ans: Cr
Saturated and unsaturated compounds If, in an organic compound consisting of two or more carbon atoms, there are just only single bonds among carbon atoms, after that the comp
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An element L has 9 protons and valency 1. Another element M has valency 3 and 5. What is the difference in the number of electrons in L and M ?
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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
Ions which have the same electronic configuration are those of: (1) Lithium and sodium (2) Sodium and potassium (3) Potassium and calcium (4) Oxygen and chlorine An
the order of stability of carbocations and carbanions For carbocation 3 degree > 2 degree > 1 degree for carbanion 1 degree > 2 degree > 3 degree
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