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Ask QuestionPosted by Ayushi Mishra 4 years, 5 months ago
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Chetan Maheshwary 4 years, 5 months ago
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Posted by Pritam Tamang 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
In the science of spectroscopy, under physics, the Rydberg constant is a physical constant relating to atomic spectra. It is denoted by R∞ for heavy atoms and RH for Hydrogen. Rydberg constant was first arising from the Rydberg formula as a fitting parameter. Later Neils Bohr has calculated it from fundamental constants.
Posted by Pritam Tamang 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
Lyman series of hydrogen atom lies in ultraviolet region, Balmer series lies in visible region while Pfund and Paschen series lie in infrared region.
Posted by Sm .. 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
ess's law of constant heat summation:
The law states that the change in enthalpy for a reaction is the same whether the reaction takes place in one or a series of steps. The Hess's law can also be stated as the enthalpy change for a chemical reaction is the same regardless of the path by which the reaction occurs.
For example, consider following two paths for the preparation of methylene chloride
Path I :
CH4(g)+2Cl2(g)→CH2Cl2(g)+2HCl(g) ΔH10=−202.3kJ
Path II :
CH4(g)+Cl2(g)→CH3Cl(g)+HCl(g)ΔH20=−98.3kJ
CH3Cl(g)+Cl2(g)→CH2Cl2(g)+HCl(g)ΔH30=−104.0kJ
Adding two steps
CH4(g)+2Cl2(g)→CH2Cl2(g)+2HCl(g) ΔH20=−202.3kJ
Thus whether we follow path I or path II, the enthalpy change of the reaction is same. ΔH10=ΔH20+ΔH30=−202.3kJ
Posted by Sidharth ($Id) 4 years, 5 months ago
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P Singh . 4 years, 5 months ago
Posted by Royal Thakur ? 4 years, 5 months ago
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Posted by Kabita Rani Sabar 4 years, 5 months ago
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Gaurav Seth 4 years, 5 months ago
The chlorine to oxygen bond distance in ClO4− is 1.44A∘. From this, we can conclude that there must be a considerable double bond character in the bonds.
Ans
From its resonating structure, it can be seen that it have considerable double bond character in the bonds.
Hence, the statement is correct.
Posted by Sm .. 4 years, 5 months ago
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Gaurav Seth 4 years, 5 months ago
Sulfur hexafluoride is a common example of an octahedral molecule. The central sulfur atom is bonded to six fluoride atoms. In molybdenum hexacarbonyl, a central molybdenum atom is bonded to six carbonyl groups.
Posted by Aman Tripathi 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
In the periodic table, elements with similar properties are repeated after intervals of 2, 8, 18, 32 etc. These numbers are called magic numbers.
Posted by Rahul Ahuja 4 years, 5 months ago
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Abhay Verma 4 years, 5 months ago
Posted by Michael Chawngthu 4 years, 5 months ago
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Aman Tripathi 4 years, 5 months ago
Meghna Thapar 4 years, 5 months ago
HSO4- is a base on the other side of equation - it is the thing that ACCEPTS the proton, so it would act as a BASE. It is the conjugate base of H2SO4. H2SO4/HSO4- is an acid/conjugate base pair. H20 is the base in the forward rxn, because it accepts a proton, and becomes H3O+. An acid and a base which differ only by the presence or absence of a proton are called a conjugate acid-base pair. Thus NH3 is called the conjugate base of NH4+, and NH4+ is the conjugate acid of NH3. Similarly, HF is the conjugate acid of F–, and F– the conjugate base of HF.
Posted by Ganesh Sherkar 4 years, 5 months ago
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Gaurav Seth 4 years, 5 months ago
In a chemical reaction, the species which loses electrons is said to be oxidised and the species which gains electrons is said to be reduced. Since there is no net loss or gain of electrons in a chemical reaction, it means that a substance can gain electron only if another substance that can lose electron is also present in the system. Similarly, a substance can lose electrons only if another substance which can gain electrons is also present in the system. This means oxidation can take place only if reduction also takes place simultaneously and vice versa. In other words, oxidation-reduction reactions are electron transfer processes and always occur side by side. Such reactions in which oxidation and reduction take place simultaneously are called oxidation-reduction or simply redox reactions. For example, consider the following reaction:
This reaction consists of two distinct simultaneous processes which take place in such a way that
No. of electrons lost = No. of electrons gained
(i) Oxidation half-reaction:
Here each atom of zinc loses two electrons and thus gets oxidised to Zn2+ ions.
(ii) Reduction half-reaction:
Thus, a redox reaction may also be defined as a reaction in which electrons are transferred from one reactant to the other.
Posted by Sonu Kumar 4 years, 5 months ago
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Yogita Ingle 4 years, 5 months ago
The ratio of kinetic energy and potential energy of an electron in a Bohr orbit of a hydrogen-like series is -1/2
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Pk ⚔️ 4 years, 5 months ago
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Pk ⚔️ 4 years, 5 months ago
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Pk ⚔️ 4 years, 5 months ago
Posted by Sm .. 4 years, 5 months ago
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Meghna Thapar 4 years, 5 months ago
In chemistry, resonance is a way of describing bonding in certain molecules or ions by the combination of several contributing structures into a resonance hybrid in valence bond theory. Resonance structures: Is defined as difference between actual bond energy and energy of most stable resonating structures. Resonance averages the bond characteristics of a molecule as a whole. Resonance stabilizes the molecule because energy of the resonance hybrid is less than the energy of any canonical forms.
Posted by Nausin Jahan Barbhuiya 4 years, 5 months ago
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Ayushi Mishra 4 years, 4 months ago
1Thank You