Recently Active Physical Chemistry Questions

1) If 5 litres of H2O2 produce 50 lites of O2 at NTP, H2O2 is a)50V b)10V c)5V d)250V I am not able to understand this question. What is it asking? 2)Assuming that petrol is octane & has density 0.8 g/ml, 1.425 litres of petr ...

1.An electrochemical cell is constructed by immersing a piece of copper wire in 50ml of 0.1M CuSO4 soln and " " ' ' zinc wire in " " " ZnSO4 soln. If 50 ml of 1.5 M NH3 is added to CuSO4 soln then Emf of cell is= Ans 0.715V g ...

2.76 gm of silver carbonate on heating strongly gives residue weighing? (Gram atomic mass of silver is 108 gm) ...

15.00 gm of a compound Na2SO4.xH2O contains 2.36*1023 H2O molecules.Find out the value of 'x' ...

Q1- Can someone please tell me the exact and well described reason for depression of freezing point on addition of non volatile solute to a solvent? Q2- How does the vapour pressure of a pure solution change when we increase ...

http://targetiit4pcm.lefora.com/2010/06/16/articles-acids-and-bases-1/0/ hope you like it ...

i have a basic doubt. Isnt order of a chemical reaction determined only experimentally ? i mean can we find order just by looking the balanced chemical eqn ? i think it can only be found out from the eqn for elementary reacti ...

*Image* I am really weak in chemistry ,so don't get upset abt the level of ques. ...

0.4 gram hydrogen combines with 3.2 gram oxygen to produce water. H2S is produced by combination of 0.25 g hydrogen and 4.0 gram sulphur. 1 gram of sulphur combines with 1 gram of oxygen. Show that the results are in accordan ...

the heats of combustion of C2H4 , C2H6 AND H2 are -1400.5Kj,-1558.3kj and -286.5kj. the heat of hydrogenation of ethene is.. pleaz solve lucidly ...

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 ...

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 ...

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 ...

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] ...

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i am a starter in physical chemistry is arihant objective approach towards physical chemistry a better book or sholud i buy standard physical chemistry book??? plz help ...

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1. The ionic radii of Ca2+ and Na+ ions are about the same yet calcium ions are more hydrated than sodium ions. Suggest an explanation for this. ...

someone please help me with this Q: The maximum radius of an atom which can occupy empty spaces (voids) in a body centred structure, of an element having atomic radius R, without causing any distortion, can be : Ans, ( 5/3 -1 ...

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A manometric fluid dibutyl phthalate has density 1.047x103 kg m-3. what pressure of this liquid of one mm height suggest? [ans. 0.077 torr] pls explian!!! ...

(1)How many eletrons in Na( atomis no. 11) satisfy the equation: 2n+l=5m+s where n, l, m, s are the principle, azimuthal, magnetic and spin quantum no.s respectively. . (a)1 (b)5 (c)6 (d) none of these . . . . (2)Which of the ...

Plz make me understand the meaning of quantum nos. & also principal quantum no.,azimuthal q.no.,magnetic q. no.,spin q. no.Explain me in such a way so that i can understand bcoz my new classes of XI have just started . ...