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102 - Physical Chemistry Questions Answers

Chemistry >> Physical Chemistry >> Surface Chemistry IIT JEE

for an endothermic rx, higher value of energy of activation will be

(a) less than enthalpy of rx.

(b) 0

(c) more than enthalpy of rx.

(d) equal to enthalpy of rx.

Asked By: HIMANSHU MITTAL
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Joshi sir comment

(c) numerically it will be (c)

Chemistry >> Physical Chemistry >> Chemical Kinetics Medical Exam

how can we find log and antilogs without the help of log and antilogs tablessad

Asked By: AVANTIKA PURI
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Joshi sir comment

there are methods but these are not good for all cases

Chemistry >> Physical Chemistry >> Thermodynamics and Thermochemistry Medical Exam

16 kg oxygen gas expands at STP isobarically to occupy double of its original volume. The work done during the process is 244 kcal. HOW????????

Asked By: AVANTIKA PURI
is this question helpfull: 5 4 read solutions ( 3 ) | submit your answer
Joshi sir comment

W = PdV = nRdT = (16*1000/32)*(8.31/4.18)*273 

now solve

Chemistry >> Physical Chemistry >> Solid State IIT JEE

In diamond,carbon atom occupy FCC lattice points as well as alternate tetrahedral voids.If edge length of the unit cell is 356pm,then radius of carbon atom is?

Asked By: VAISHALI JHA Solved By: SARIKA SHARMA
is this question helpfull: 21 16 read solutions ( 2 ) | submit your answer
Joshi sir comment

for fcc lattice a√2 = 4r

Chemistry >> Physical Chemistry >> Solid State IIT JEE

how many lattice points are there in one unit cell of face centered tetragonal

Asked By: VAISHALI JHA
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Joshi sir comment

8 corners contributing 1/8

6 faces contributing 1/2

Chemistry >> Physical Chemistry >> Solid State Medical Exam

IN A GIVEN COMPD THE BONDING FORCES ARE AT SHORT RANGE & ARE SPHERICALLY DISTRIBUTED . THE TYPE OF BONDING REFERRED TO IS C/A

A) COVALENT

B) METALLIC

C) HYDROGEN

D) IONIC

Asked By: SARIKA
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Joshi sir comment

the formation of covalent bond requires overlapping of partially occupied short-range repulsive potential due to the distortion of the electron clouds 

so answer will be covalent 

Chemistry >> Physical Chemistry >> Solutions Medical Exam

blushblush THE PRESSURE OF ATMOSPHERE AIR IS 720 mm  . THE PRESSURE OF WATER VAPOUR IN THE AIR IS

A) 5.55

B) 21

C) 18

D) ZERO

Asked By: SARIKA
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Joshi sir comment

In this question atmospheric pressure should be given then 

P0 - 720 mm will be the answer.

Chemistry >> Physical Chemistry >> Thermodynamics and Thermochemistry Medical Exam

the heat of formation of MgO, Al2O3, , And SiO2 Are -692, -1676, -911 kJ/mol . most stable oxide is

A) MgO

B) Al2O3

C) SiO2

D) can't be predicted

Asked By: SARIKA
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Joshi sir comment

Al2O3

Chemistry >> Physical Chemistry >> Solutions Medical Exam

smileywhat will be the conc of nitrate ion when 400ml of 0.1 M AgNO3 is mixed with 100 ml of 0.2 m BaBr2

Asked By: SARIKA SHARMA
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Joshi sir comment

 

no. of miligm. eq. of AgNO3 = 400*0.1 = 40

no. of miligm. eq. of BaBr2 = 100*0.2*2 = 40

so no of miligm. eq. of Ba(NO3)2 = 40 so no. of milimoles of Ba(NO3)2 = 20

so [NO3-] = 20*2/500 = .08 M    

Chemistry >> Physical Chemistry >> Solutions Medical Exam

smiley WHICH OF THE FOLLOWING HAS LOWEST BOILING PT.  (HARY. PMT 2003)

1)  NaCl

2) CuCl

3)  CuCI2

4) CsCl

SIR ANSWER GIVEN IS(3)  . BUT AS THE NO. OF IONS IS MAX IN CuCl2 SO IT SHOULD HAVE MAX BP . THEN WHY ITS BP WILL BE MIN. ??

Asked By: SARIKA SHARMA
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Solution by Joshi sir

 

The only possibility is that the dissociation of the salt CuCl2 is low yet NaCl and CsCl are strongly dissociable salts. But CuCl should be less dissociable than CuCl2 . On this basis answer should be CuCl.

It is also probable that the question will be highest boiling point. 

 

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