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217 - Chemistry Questions Answers

Chemistry >> Physical Chemistry >> Thermodynamics and Thermochemistry IIT JEE

show that (du/dv)s=T-sdp

 

Asked By: KARTHIKCHEMIST
is this question helpfull: 2 2 submit your answer
Joshi sir comment

question is incorrect 

because (du/dv)s represents pressure and T is temperature

Chemistry >> General Chemistry >> Chemical Bonds Medical Exam

Which of the following hydrides has the highest M-H bond polarity

(a) AsH3           (b) BiH3            (c) SbH3          (d) None of these

Asked By: SWATI KAPOOR
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Joshi sir comment

electronegativity of H = 2

and for all other elements in this question electronegativity is less than 2 

least for Bi 

so diff. for Bi is max so max polar

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

The average kinetic energy of an ideal gas, per molecule in S.I. units, at 25 °C will be ..........

Asked By: SWATI KAPOOR
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Joshi sir comment

formula is {3RT/2}/N = 3kT/2

N and k are gas and Boltzmann constant

Chemistry >> General Chemistry >> Atoms and molecules Others
FROM WHERE ELECTRON GET ENERGY
Asked By: SACHIN TRIPATHI
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Joshi sir comment

Consider about the amount of energy required. It can gain from its surrounding

Chemistry >> Physical Chemistry >> Solutions Engineering Exam

q. = Mass of solution of 1 molal glucose solution to get 0.2 molal glucose is.

a.200

b.300

c.236

d.108

Asked By: NIRMIT MAHESHWARI
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Joshi sir comment

I think question is incomplete, correct it first

Chemistry >> Physical Chemistry >> Solutions IIT JEE

acetic acid in a solvent undergoes 20% dissociation and 70% association, find vant hoff factor. 

Asked By: TABREZ
is this question helpfull: 2 0 read solutions ( 1 ) | submit your answer
Joshi sir comment

CH3COOH  = CH3COO- + H+

     1                     0                 0

    0.8                 0.2               0.2

CH3COO- + H+ = CH3COOH

0.2             0.2               0.8

0.06            0.06           0.8+0.14

0.06             0.06              0.94                      sum = 1.06

so i = 1.06/1 = 1.06 

 

 

 

 

Chemistry >> Physical Chemistry >> Solutions IIT JEE

calculate the molecular weight of cellulose acetate if its 0.2%wt/vol solution in acetone(sp. gravity 0.8) shows osmotic rise of 23.1mm against pure acetone at 27C.

Asked By: HEMA RANI
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Joshi sir comment

By formula πV = nRT

π = hdg, n=w/M

given 

0.2%wt/vol solution in acetone means w= 0.2 gm, V = 100 ml= 100/1000 litre = 0.1*10-3 m3 ,   h = 23.1/1000 m, d = 800 kg/m3 ,  

now solve

Chemistry >> Inorganic Chemistry >> Co ordination compounds IIT JEE
what is mean to bi dentate ligand ?
Asked By: ESWARAN M
is this question helpfull: 4 1 read solutions ( 1 ) | submit your answer
Joshi sir comment

BI DENTATE means having 2 pair of electrons to donate

Chemistry >> Inorganic Chemistry >> s block elements IIT JEE
Why Al(OH)3 is amphoteric while Ti (OH)3 is basic
Asked By: SHEREEN
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Joshi sir comment

With acids Al(OH)3 gives Al3+ and with bases it gives Al(OH)4- , but stable valency for Tl is 1 so it treats only with acids to form Tl+

Please check it is Ti or Tl, I think it is Tl belonging the family of Al

Chemistry >> Physical Chemistry >> Chemical and Ionic Equilibrium Medical Exam

what is the ph of the solution formed by mixing 20 ml of 0.05 M H2SO4 with 5 ml of 0.45 M NaOH at 298 k ?

Asked By: SAMREEN KOUR
is this question helpfull: 3 4 submit your answer
Joshi sir comment

mili eq of acid = VN = 20*0.1 = 2

mili eq of base = VN = 5*0.45 = 2.25

total milieq = 2.25-2 = 0.25 of base in 25 ml

so N = 0.25/25 = 10-2

so pOH = 2 so pH = 12

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