Recently Active Chemistry Questions

1.what are amphiprotic substances ? 2. which of the following is not an amphiprotic substances: a.h2o b.hco3-ve c.hso4-ve d.hpo4di-ve ...

what is fractional abundance in terms of isotopes while calculating atomic wt.? ...

1.If a solute undergoes dimerization & trimerization the minimum values of Van.t Hoff factor are.... 2.A complex is written as M(en)y.xBr.Its 0.05 molar soln shows 2.46 atm osmotic presure at 300 K.Assuming 100% ionistion and ...

What do you mean by"parts by weight of something" in general? Please also explain it in context with law of multiple proportions ...

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AN ATTEMPT TO HELP 1) Stereochemistry of diel's alder reaction : If a Diels–Alder reaction creates an aymmetric carbon in the product, identical amounts of the R and S enantiomers will be formed. In other words, the product ...

organic chemistry ...

assuming buffer in blood is CO2 - HCO3- ,calculate the ratio of conjugate base to acid neccessary to maintain blood at its pH 7. given: K1(H2CO3)=4.5 * 10-7 answer: 11 i m getting answer as 11*55.55 ...

*Image* ANS.375ml,195ml,162.19 ...

1.what is amximum no. of electrons in an atom in which the last electron filled has following quantum numbers: 1.n=3 l=2 m=-1 2.n=3 l=1 m=-1 3.n=3 l=2 m=0 s=-1/2 answers::: 1.27 2.16 3.28 plz plz explain how u got the above a ...

*Image* MORE THAN 1 OPTION MAY BE CORRECT ...

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plz suggest me a good book on organic chemistry with lots of questions...i feel this is the topic where i hav a lot of scope to improve!!! ...

In what way can you convert (CH3)3N to (CH3)2NH? Not a doubt. Try...and later I'll mention the direct method. ...

*Image* PLEASE EXPLAIN THE MECANISM CLEARLY... ...

because of the great tendency of neopentyl carbocation to rearrange neopentyl chloride cannot be made from neopentyl alcohol... how would u prepare neopentyl chloride from alcohol? ...

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Q1: On applying alkali solution followed by acidification which of the following gives lactone: *Image* Q2: Give the end product of (A,B,C,D) when each of them is treated with base: *Image* Q3: Arrange them in order of increa ...

Arrange the following compounds in order of increasing dipole moment Toulene (I) m-dichlorobenzene (II) o - dichlorobenzene (III) p - dichlorobenzene (IV) (A) I < IV <II <III (B) IV < I < II < III (C) IV < ...

In which of the following diagrams of enthalpy vs reactions progress for two step reactions is the second step fast but essentially irreversible while the first step slow and reversible *Image* A B C D ANS B ...

Could be of some help to all --- A chemical reaction is a process in which one set of chemical substances (reactants) is converted into another (products). It involves making and breaking chemical bonds and the rearrangement ...

how do you account for the fact that, although diethyl ether has a much lower boiling point than n-butyl alcohol, it has same solubility(8 grams per 100 g) in water? ...

*Image* (I)→ Ethyl 1-phenyl-2-propyl ether α=+19.84° (II)→Ethyl 1-phenyl-2-propyl ether α=--19.90° a) account for the fact that the ethers obtained by two routes have opposite but equal optical rotations? b) Does it m ...

this might be silly bt this is my dbt.. suppose an optically active substrate undergoes a reaction such that the configuration is retained i.e. no bonds of the chiral atom is broken now is this true that if an (S)(+) is react ...

::ORGANIC:: there are points in learning where u want to tell everyone wat all new concepts u learnt...so here is our thread...a thread specially for nawshikhio like me in organic...experts are prohibited except to correct if ...

What is octane number concept ? Help me calculate octane numbers of n-octane,n-heptane,n-nonane ...

1) A chemical contained in tea is also contained in the bark of a tree. It is used for making ink removers. that chemical is a) tannic acid b)oxalic acid c)carbonate d) cellulose 2)which of the following cannot dissolve in ca ...

hopeless chem questions Q1. Choose the incorrect statement (a) In [Fe(CN)6]4- , Fe-C bond length is smaller than Fe-C bond length in [Fe(CN)6]3- (b) EAN of Fe in [Fe(CN)6]4- is 36 (c) [Fe(CN)6]3- is more stable than [Fe(CN)6] ...