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Chemistry >> General Chemistry >> Mole Concept and Stoicheometry Medical Exam

A sample of fuming HNO3 is labelled as 110% . assume that the labelling of fuming is similar the labelling of oleum . What is the % of free N2O5 in the sample??

plz annex explanatn also ans is 60%

Asked By: SARIKA
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Joshi sir comment

x % HNO3 --------------------- 100 + (18/108)*x % of fuming HNO3

so 18x/108 = 10 

or x = 60 %

 

Chemistry >> General Chemistry >> Chemical Bonds Medical Exam

which of the following has the maximum value for van der waals constant b - H2O (g) , AlCl3 (g), Cl2 (g)

Asked By: SWATI KAPOOR
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Joshi sir comment

b depends on size so on the basis of size order will be AlCl3>Cl2>H2O

This answer is given by Sarika and is correct answer

 

Chemistry >> General Chemistry >> Chemical Bonds Medical Exam

the type of interaction present between NO3- ion and I2 molecule is ion-dipole interactions or ion-induced dipole interactions.Explains the difference between the two also.

 

Asked By: SWATI KAPOOR
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Joshi sir comment

I2 is non polar molecule so it will be ion-induced dipole interactions 

Chemistry >> General Chemistry >> Chemical Bonds Medical Exam

Arrange the following molecules in the increasing order of ionic characters,

LiF, K2O, N2, SO2, ClF3 

Asked By: SWATI KAPOOR
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Joshi sir comment

N2, SO2, ClF3, K2O, LiF

Solution by Joshi sir

N2, SO2, ClF3, K2O, LiF

This order is due to difference of electronegativity of atoms in a molecule

more difference more will be the ionic character

Chemistry >> General Chemistry >> Chemical Bonds Medical Exam

The ratio of positive charge on H- atom in HX to that in HY from the following data is 

Dipole moment of HX = 1.14 D and HY = 0.38 D

Bond length of HX = 127pm and HY = 170pm

Options are - (i) 3:4 ,   (ii) 4:1  ,  (iii) 1:4

Asked By: SWATI KAPOOR
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Joshi sir comment

dipole moment = charge * bond length

now solve

Chemistry >> General Chemistry >> Atoms and molecules IIT JEE

the first line in the balmer series in the hydrogen spectrum will have the frequency

Asked By: SWATI KAPOOR
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Joshi sir comment

f/c = R[ 1/22 - 1/32 ]

R and f are Rydberg constant and frequency

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

differential form of boyle's law

Asked By: SWATI KAPOOR
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Joshi sir comment

 dV/dP = -V/P

Chemistry >> General Chemistry >> Chemical Bonds Medical Exam

In [Ag(CN)2]- and [Ag(NH3)2]- , the number of π-bond respectively are

Asked By: SWATI KAPOOR
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Joshi sir comment

number of π-bond in [Ag(CN)2]- is 4 and in [Ag(NH3)2]- , it is 0

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

the de- Broglie wavelength of a tennis ball of mass 200g and moving with a speed of 5m/h is of the order

10-20  , 10-30 ,   10-40

Asked By: SWATI KAPOOR
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Joshi sir comment

λ = h/mv

put values and solve but first convert all values in MKS

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

6.3g of hydrated oxalic acid is treated with M/20 Mg(OH)2. The volume of Mg(OH)2 used for complete neutralisation is

Asked By: SWATI KAPOOR
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Joshi sir comment

gm eq of oxalic acid = 6.3/63 = 0.1

gm eq of Mg(OH)2  = (1/20)*2*V

now compare the two

 

 

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