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class 11 chemistry Notes Catenation (i) The tendency of formation of long open or closed atom chains by the combination of same atoms in themselves is known as catenation. (ii) The catenation is maximum in carbon and decreases down the group. (iii) This is due to high bond energy of catenation. Bond Bond energy in … Continue reading What is Catenation ?
Boranes Structures of the boranes The bonding and structure of the boranes are of great interest. They are different from allother hydrides. There are not enough valency electrons to form conventional two-electronbonds between all of the adjacent pairs of atoms and so these compounds are termedelectron deficient. In diborane there are 12 valency … Continue reading Boranes
Orthoboric acid (H3BO3) Structure of orthoboric acid Orthoboric acid contains triangular units. In the solid, the B(OH)3 units are hydrogen bonded together into two-dimensional sheets with almost hexagonal symmetry. The layers are quite a large distance apart and thus the crystal breaks quite easily into very fine particles. Preparation Na2B4O7 + … Continue reading Orthoboric acid (H3BO3)
In class 11 chemistry notes we will describe the inert pain effect In the s-block, group I elements are univalent and group II elements are divalent. In group III we would expect the elements to be trivalent. In most of their compounds this is the case, but some of the elements show lower valency states … Continue reading Class 11 Chemistry Notes on P-Block
How to give entrance exam Doing well in the test requires a solid understanding of the course content, as well as a positive attitude and strategic planning and thinking. A. when you start preparation for test,set a realistic study schedule and begin studying early .short study session spread out over time are more efficient than … Continue reading How to give entrance exam
https://www.entrancei.com/online-test-class-twelve/chemistry-class-12 Ques 1: Calculate the no. of moles in the following- (a) 7.85g of iron (b) 4.68mg of silcon (c)65.6μg of carbon Ques 2: Calculate the no. of moles in the following masses- (a) 1.46 metlic tones of Al (1 metlic Ion =103Kg) (b) 7.9mg of Ca Ques 3: Chlorophyic the … Continue reading chemistry CBSE class XI sample paper
ACTINIDES The series of elements involving the filling of 5f orbitals is called actinide series. They follow Ac (89) and include elements from Th(90) to Lw(103). The chemistry of actinides is more complicated due to the existence of greater range of oxidation states for these metals. Moreover, all these metals are radioactive and therefore, their … Continue reading ACTINIDES
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