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    Halochromism in Phenolphthalein

    Thanks for whatever information you have given me.
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    Halochromism in Phenolphthalein

    Thank you sir. I was previously obsessed by the fact that a nucleophile doesn't attack a site which has pi electrons around it because in alkene chemistry we often see an electrophile attacking at pi electrons. But now it seems that a nucleophile could do so if it has enough of energy to...
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    Halochromism in Phenolphthalein

    Now probably I got the point. Phenolpthalein is acidic because it is phenol-pthalein and as the concentration of hydroxide ion increases in the reaction mixture a less stronger base eventually appears i.e.In(OH)3-. Is it just as simple as this?
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    Halochromism in Phenolphthalein

    Thank you sir for giving consideration to my post. But I would like to ask is it really so bad to have sp2 hybrid state that a nucleophile like hydroxide ion could approach you at a relatively low concentration of about 0.01M inspite of the fact that a powerful +R group like phenoxide ion...
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    Halochromism in Phenolphthalein

    Come on guys! I am still waiting for your response.
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    Halochromism in Phenolphthalein

    It is known that when pH of solution is greater than 12 phph solution turns colorless. And the structural change which occurs is I want to ask why OH_ group attack sp2 hybridized carbon atom attached to three different rings? How elecrophilic site is generated there? In one of its bonding...
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    Kinetic theory of Gases

    Yeah, you were right Philip Wood in saying that excluded volume is not negligible under 1 bar pressure and 1000K temperature infact my calculation showed me that it could make a impact on the second decimal place of volume (measured in liters) which is sufficient in describing the CF mention on...
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    Kinetic theory of Gases

    Thanks Philip Wood. The equation of state which you have mentioned could be rearranged as P(V-b)=RT, it means you are excluding volume b from original volume occupied by one mole of real gas at temperature T, but this process of excluding would be significant only when volume occupied by gases'...
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    Kinetic theory of Gases

    Thanks for the reply. I think you guys have not understand what I am trying to say. Boyle's point and compressibility factor is about how well a real gas obey the stuffs that you are taking about. I want to know why gases do not follow ideal gas equation or CF is greater than one when...
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    Kinetic theory of Gases

    Thanks Philip Wood for replying. My problem was not addressed there. How it could be possible that on increasing the temperature above Boyle's point compressibility factor increases beyond one with out increasing the pressure to any substantial amount? The factors which deviates a gases from...
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    Kinetic theory of Gases

    Hi I would like to ask is there any relation between compressibility factor of gases and temperature? My text book says that it always increases with increase in temperature but doesn't explains how? I know that on increases the temperature it is harder for molecules to show attractive...
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    Light Matter interaction

    Hi I would like to ask that what makes a transparent medium transparent ? What happens when a photons of light passes through our atmosphere ? I suppose that visible spectrum of light passes through atmosphere without causing excitation of electrons of gases' molecules, but what happens when...
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    Oracle8i installation error

    I am using Windows XP (sp2). When I run setup file of Oracle for insallation I get the error rdbms80.map(0) File_Not_Found while mapping rdbms80. Please help to fix this error!
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    Colour of complex compounds and crystal field theory

    Hello Drdu. When a coordination entity say [Cu(H2O)4]2+ absorb a photon and goes to exited state then what will happen to the next photon which is incidented on same coordination complex which it has absorbed earlier? Will it be reflected back because there is no electron available for d-d...
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    Colour of complex compounds and crystal field theory

    Hi It is know that the colour exhibited by coordinate compound is because of d-d electron transitions. These d-d transition lead to absorption of photons of a paticular frequence. AND when a electron become exited due to absorption of photon it should radiate electromagnetic wave of frequency...
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    Orbital energy and Electronic Configurations

    Thankyou very much alxm. I think I need to do a lot of work on quantum mechanics but the stream opted by me doesn't allows me do so ! But anyways thanks.:wink:
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    Orbital energy and Electronic Configurations

    Hi I have questions related to the electronic configurations of elements of d and f-block. First I want to ask a question about the E.C. of Lanthanium. This element has E.C. [Xe]5d16s2, but according to Bohr-Bury rule 4f-orbitals should be filled prior to 5d-orbital and then Lanthanium’s E.C...
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    Structure of SO2

    Thanks Drdu. But I think, I will have to work out mechanism myself.
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    Structure of SO2

    Drdu_Once again Thanks.:smile: The link provided by you helped me to understand what you wanted me to infer earlier. Now I am putting up some thought about which I am not completely sure. Formation of sulphut dioxide is a bimolecular process invoving one sulphur atom and one oxygen gas...
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    Structure of SO2

    Drdu_.Thanks, for posting such a incomplete answer! I have posted this thread so that I can come across people who really know the truth and don't hesitate to share that with other. But anyways, thanks for replying.
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    Structure of SO2

    Hi I was trying to understand the geometry of Sulphur Dioxide molecule on the basis of hybridisation involved in the central atom. I found that Sulphur atom should have SP2 hybridisation. I want to know that is there any promotion of electron from 3 p-orbitals to 3d-orbitals and then forming...
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    Plamids role in bacterial cell

    Thanks. jansmith and sorry for replying late. I was just trying to understand how plasmid can be used as a cloning vector. And as you said plasmids containing a gene for antibiotic resistance can multiply their copies if surrounding medium contains antibiotic but you also said that plasmids...
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    Plamids role in bacterial cell

    Hi I want to know about the role which plasmids play in a baterial cell.How the genes which are coded in plasmid DNA expressed themselves ? Does the transcription of plasmid DNA takes place independently of chromosomal DNA I mean to say that do the plasmids have promotor sequence for RNA...
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    Qualitatively define entropy

    Thanks Gerenuk. I have a another question which is as follows:- In statistical mechanics it is said that molecular motional energies is quantised and in a given microstate of a macrostate they have definite arrangements in energy levels for total energy of that macrostate. And if moleular...
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    Qualitatively define entropy

    Hi, I want to know a concrete qualitative definition of entropy. If we define it to be a measure of randomness (disorder) in a system then as per intuition it would mean that a system with less probability in a given microstate will have greater entropy. But as per statistical mechanics...
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    Charge displacement through a conductor

    Naty1 you gave a very right complement about K2. As far as that idea is conserned consider a momentary flow of charge on the application of definite electric field as long as that charge separation generates its own electric field to counter attack the external electric field and think about...
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    Charge displacement through a conductor

    Thanks to both of you. But I am thinking about it as follows :- I am speculating that for a bit let us consider the rate of charge flow through a conductor as charge separation taking place in giving time then charge separation which takes place in time dt will be IxdtxVbxdt for a current I...
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    Charge displacement through a conductor

    Thanks Antiphon for responding. But I want to know that if a current I is flowing in a conductor it would mean that in one second charge equal to magnitute of I would be able to flow across a area placed perpendicular to the flow of current but if we take 'centre of charge' in to consideration...
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    Charge displacement through a conductor

    I read this in book that if we consider a conductor in which current I is flowing at a potential difference of V then in time ∆t charge equal to I ∆t will flow across the ends of conductor. But in time ∆t that much amount of charge will only be able to travel distance equal to drift velocity...
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