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Chemistry >> General Chemistry >> Kinetic Theory of Gases AIEEE

Two flasks of equal volume connected by narrow tube(of negligible volume) are at 300K and contains 0.7 mole of H2(.35 mole in each flask) at 0.5 atm.One of the flask is then immersed in a bath kept at 400k while the other remains at 300K. Caculate the final pressure and the number of moles of H2 in each flask.

Asked By: ABHISHEK PAHI
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Joshi sir comment

by gas eq.  PV/nT = constant

so 0.5*2V/0.7*300 = PV/n1400 + PV/n2300        (1)

no. of moles are also constant

so 0.7 = n1 + n2

similarly by gas eq. 

PV = n1R400                      for first flask

PV = n2R300                      for second flask

now solve

Chemistry >> General Chemistry >> Kinetic Theory of Gases Board Exam

Calculate molecular diameter of  He from its Van der Waal's constant  b=24ml/mole.

Asked By: ABHISHEK PAHI
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Joshi sir comment

b = 4V, where V is volume of 1 mole particles

so 24*10-6 cm3/mole = 4*[4πr3/3] cm3/mole 

now solve

 

 

Chemistry >> General Chemistry >> Kinetic Theory of Gases Board Exam

The Total energy of one mole of an ideal monoatomic gas at 300K is____.

Asked By: ABHISHEK PAHI
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Joshi sir comment

= 3RT/2 

 

Chemistry >> General Chemistry >> Atoms and molecules AIEEE

if there are Three Fe+2  For a Fe+3 in FexO, What is the value of x? 

 

Asked By: BONEY HAVELIWALA
is this question helpfull: 1 1 read solutions ( 5 ) | submit your answer
Joshi sir comment

3FeO.1Fe2O3 = Fe5O6 = Fe5/6O

 

 

 

 

 

Chemistry >> Inorganic Chemistry >> Peridic table IIT JEE

Zinc but not copper is used for recovery  of Ag From the complex [Ag(CN2)]-  . Why?

 

Asked By: AAYUSH TANEJA
is this question helpfull: 4 3 read solutions ( 1 ) | submit your answer
Joshi sir comment

Zn is better reducing agent in comparison to Cu for the said complex so it is used

besides it answer by sarika is correct too

Chemistry >> Organic Chemistry >> Alkyl Halides, Alcohols and ethers IIT JEE

CH3-(CHBr)-CH2-CH3   +  Na  --------> ?

 

 

Asked By: AAYUSH TANEJA
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Joshi sir comment

in presence of ether it is Wurtz reaction and as obvious many products will be formed.

Major product will be CH3-CH2-CH(CH3)-CH(CH3)-CH2-CH3

Chemistry >> Organic Chemistry >> Alkyl Halides, Alcohols and ethers IIT JEE

Arrange The Following in increasing order of reactivity towards nucleophilic substitution and give reason :

CH3F , CH3Cl , CH3Br , CH3I  .

 

Asked By: AAYUSH TANEJA
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Joshi sir comment
Better the leaving group the compound contains, more reactive the compound will be 
towards the nucleophilic sustitution.
Order of decreasing reactivity. 
 
CH3I > CH3Br > CH3Cl > CH3F 
 
Chemistry >> Organic Chemistry >> Alkyl Halides, Alcohols and ethers IIT JEE

Arrange The Following in increasing order of dipole moment and give reason :

Dichloromethane , chloroform , carbon tetrachloride .

Asked By: AAYUSH TANEJA
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Joshi sir comment

Dichloromethane > chloroform > carbon tetrachloride 

Chemistry >> Inorganic Chemistry >> p block elements IIT JEE

Arrange The Following in increasing order of boiling points and give reason :

1-chloropropane , isopropylchloride , 1-chlorobutane ,

Asked By: AAYUSH TANEJA
is this question helpfull: 7 6 read solutions ( 2 ) | submit your answer
Joshi sir comment

1-chloropropane < 1-chlorobutane < isopropylchloride

Chemistry >> Inorganic Chemistry >> p block elements IIT JEE

Arrange The Following in increasing order of boiling points and give reason :

Dibromomethane , bromoform , Chloromethane , Dichloromethane .

 

Asked By: AAYUSH TANEJA
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Joshi sir comment

Chloromethane, Dichloromethane, Dibromomethane, Bromoform

B P increases with molecular mass 

 

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