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Chemistry >> Organic Chemistry >> Nomenclature and isomerism Board Exam

what is issomers

Asked By: AMIR KHAN
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Joshi sir comment

isomer means compound with same molecular formula but different structural formula.

Chemistry >> Inorganic Chemistry >> p block elements Board Exam

Is flurine has more oxidising power ?

Asked By: GOWTHAM
is this question helpfull: 8 4 read solutions ( 1 ) | submit your answer
Joshi sir comment

yes it is a very good oxidising agent

Chemistry >> Inorganic Chemistry >> p block elements Medical Exam

Is there any difference b/w  SULPHUR AND SULFUR ??

Asked By: SARIKA
is this question helpfull: 7 0 read solutions ( 1 ) | submit your answer
Joshi sir comment

no there is no difference

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

cheeky THE CONSTANT a  IN VAN DER WALL'S EQN IS MAXM IN

A) He

B) NH3

C) CO2

D) N2

Asked By: SARIKA
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Joshi sir comment

 

Carbon dioxide                   a = 3.640

 

Helium                               a = 0.03457

 

Nitrogen                             a = 1.408

 

Ammonia                           a = 4.225

more ideal gases has lower values of a

 

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    

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