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When degenerate d-orbitals of an iSolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost The two set t subscript 2 g end subscript open parentheses d subscript x y end subscript comma d subscript y z end subscript comma d subscript x z end subscript close parentheses and open parentheses d subscript z to the power of 2 end exponent end subscript comma d subscript x to the power of 2 end exponent minus y to the power of 2 end exponent end subscript close parentheses are either stabilized or destrabilized depending upon the nature of magnetic fieldIt can be expressed diagrammatically as:
Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for capital delta is about 4/9 times to capital delta subscript 0 end subscript tetrahedral complexes, (CFSE for octahedral complex)This energy lies in visible region and i.e., why electronic transition are responsible for colour Such transitions are not possible with d0 and d10 configuration.
For an octahedral complex, which of the following d-electron configuration will give maximum CFSE?

  1. High spin d6    
  2. Low spin d4    
  3. Low spin d5    
  4. High spin d7    

The correct answer is: Low spin d5

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General
chemistry-

When degenerate d-orbitals of an iSolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost The two set t subscript 2 g end subscript open parentheses d subscript x y end subscript comma d subscript y z end subscript comma d subscript x z end subscript close parentheses and open parentheses d subscript z to the power of 2 end exponent end subscript comma d subscript x to the power of 2 end exponent minus y to the power of 2 end exponent end subscript close parentheses are either stabilized or destrabilized depending upon the nature of magnetic fieldIt can be expressed diagrammatically as: 
Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for capital delta is about 4/9 times to capital delta subscript 0 end subscripttetrahedral complexes, (CFSE for octahedral complex)This energy lies in visible region and i.e., why electronic transition are responsible for colour Such transitions are not possible with d0 and d10 configuration.
The d-orbitals, which are stabilised in an octahedral magnetic field, are –

When degenerate d-orbitals of an iSolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost The two set t subscript 2 g end subscript open parentheses d subscript x y end subscript comma d subscript y z end subscript comma d subscript x z end subscript close parentheses and open parentheses d subscript z to the power of 2 end exponent end subscript comma d subscript x to the power of 2 end exponent minus y to the power of 2 end exponent end subscript close parentheses are either stabilized or destrabilized depending upon the nature of magnetic fieldIt can be expressed diagrammatically as: 
Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for capital delta is about 4/9 times to capital delta subscript 0 end subscripttetrahedral complexes, (CFSE for octahedral complex)This energy lies in visible region and i.e., why electronic transition are responsible for colour Such transitions are not possible with d0 and d10 configuration.
The d-orbitals, which are stabilised in an octahedral magnetic field, are –

chemistry-General
General
chemistry-

hen degenerate d-orbitals of an iSolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost The two set t subscript 2 g end subscript open parentheses d subscript x y end subscript comma d subscript y z end subscript comma d subscript x z end subscript close parentheses and open parentheses d subscript z to the power of 2 end exponent end subscript comma d subscript x to the power of 2 end exponent minus y to the power of 2 end exponent end subscript close parentheses are either stabilized or destrabilized depending upon the nature of magnetic fieldIt can be expressed diagrammatically as:

Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for capital delta is about 4/9 times to capital delta subscript 0 end subscripttetrahedral complexes, (CFSE for octahedral complex)This energy lies in visible region and i.e., why electronic transition are responsible for colourSuch transitions are not possible with d0 and d10 configuration.
The CFSE for open square brackets C o C l subscript 6 end subscript close square brackets to the power of 4 minus end exponent complex is 18000 cm–1The capital deltafor open square brackets C o C l subscript 4 end subscript close square brackets to the power of 2 minus end exponent will be –

hen degenerate d-orbitals of an iSolated atom/ion come under influence of magnetic field of ligands, the degeneracy is lost The two set t subscript 2 g end subscript open parentheses d subscript x y end subscript comma d subscript y z end subscript comma d subscript x z end subscript close parentheses and open parentheses d subscript z to the power of 2 end exponent end subscript comma d subscript x to the power of 2 end exponent minus y to the power of 2 end exponent end subscript close parentheses are either stabilized or destrabilized depending upon the nature of magnetic fieldIt can be expressed diagrammatically as:

Value of CFSE depends upon nature of ligand and a spectrochemical series has been made experimentally, for capital delta is about 4/9 times to capital delta subscript 0 end subscripttetrahedral complexes, (CFSE for octahedral complex)This energy lies in visible region and i.e., why electronic transition are responsible for colourSuch transitions are not possible with d0 and d10 configuration.
The CFSE for open square brackets C o C l subscript 6 end subscript close square brackets to the power of 4 minus end exponent complex is 18000 cm–1The capital deltafor open square brackets C o C l subscript 4 end subscript close square brackets to the power of 2 minus end exponent will be –

chemistry-General
General
chemistry-

Double salts are addition compounds which lose their identity in aqueous Solution whereas complexes which are also addition compounds do not lose their identity in aqueous Solution. The coordination compounds show isomerism and find applications in photography, qualitative analysis, metallurgy, water purification and in the treatment of various diseases.
Which of the following statements is incorrect ?

Double salts are addition compounds which lose their identity in aqueous Solution whereas complexes which are also addition compounds do not lose their identity in aqueous Solution. The coordination compounds show isomerism and find applications in photography, qualitative analysis, metallurgy, water purification and in the treatment of various diseases.
Which of the following statements is incorrect ?

chemistry-General
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General
chemistry-

Statement-I : EAN of Fe in ferrocene is 36
Statement-II : 6straight pi e are co-ordinated by each cyclo pentadien ring with central metal ion.

Statement-I : EAN of Fe in ferrocene is 36
Statement-II : 6straight pi e are co-ordinated by each cyclo pentadien ring with central metal ion.

chemistry-General
General
chemistry-

Which of the following ions are optically active?
I)
II)
III)
IV) 

Which of the following ions are optically active?
I)
II)
III)
IV) 

chemistry-General
General
chemistry-

Of the following configurations, the optical isomers are :
I)
II)
III)
IV) 

Of the following configurations, the optical isomers are :
I)
II)
III)
IV) 

chemistry-General
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General
chemistry-

The complexes given below show : and 

The complexes given below show : and 

chemistry-General
General
maths-

Suppose that the number of telephone calls coming into a telephone exchange between 10 A.M. and 11A.M., say, X1 is a random variable with poison distribution with parameter 2. Similarly the number of calls arriving between 11 A.M. and 12 noon, say X2 also follows a poison distribution with parameter 6. If X1 and X2 are independent, the probability that more than 5 calls come in between 10 A.M. and 12 noon is

Suppose that the number of telephone calls coming into a telephone exchange between 10 A.M. and 11A.M., say, X1 is a random variable with poison distribution with parameter 2. Similarly the number of calls arriving between 11 A.M. and 12 noon, say X2 also follows a poison distribution with parameter 6. If X1 and X2 are independent, the probability that more than 5 calls come in between 10 A.M. and 12 noon is

maths-General
General
chemistry-

The van der Waals constant for gasesblank A comma blank B comma and C are as follows:

Which gas has the highest critical temperature?

The van der Waals constant for gasesblank A comma blank B comma and C are as follows:

Which gas has the highest critical temperature?

chemistry-General
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General
chemistry-

The distribution of the molecular velocities of gas molecules at any temperature T is shown below. (The plot below is known as Maxwell’s distribution of molecular speeds.)

Where
v is molecular velocity
n is number of molecules having velocity v
Let us define increment N subscript v end subscript, which is equal to the number of molecules between the velocity range v and v plus increment v, given by
increment N subscript v end subscript equals 4 pi N a to the power of 3 end exponent e to the power of negative b v to the power of 2 end exponent end exponent v to the power of 2 end exponent increment v
Where
N is total number of molecules
a equals square root of fraction numerator M subscript 0 end subscript over denominator 2 pi R T end fraction end root and b equals square root of fraction numerator M subscript 0 end subscript over denominator 2 R T end fraction end root
R is universal gas constant
T is temperature of the gas
M subscript 0 end subscript is molecular weight of the gas
SI units of a are

The distribution of the molecular velocities of gas molecules at any temperature T is shown below. (The plot below is known as Maxwell’s distribution of molecular speeds.)

Where
v is molecular velocity
n is number of molecules having velocity v
Let us define increment N subscript v end subscript, which is equal to the number of molecules between the velocity range v and v plus increment v, given by
increment N subscript v end subscript equals 4 pi N a to the power of 3 end exponent e to the power of negative b v to the power of 2 end exponent end exponent v to the power of 2 end exponent increment v
Where
N is total number of molecules
a equals square root of fraction numerator M subscript 0 end subscript over denominator 2 pi R T end fraction end root and b equals square root of fraction numerator M subscript 0 end subscript over denominator 2 R T end fraction end root
R is universal gas constant
T is temperature of the gas
M subscript 0 end subscript is molecular weight of the gas
SI units of a are

chemistry-General
General
chemistry-

The figure given below shows three glass chambers that are connected by valves of negligible volume. At the outset of an experiment, the valves are closed and the chambers contain the gases as detailed in the diagram. All the chambers are at the temperature of 300 K and external pressure of 1.0 atm
P subscript e x t end subscript equals 1.0 atm

What will be the work done by N subscript 2 end subscript gas when valve 2 is opened and value 1 remains closed?

The figure given below shows three glass chambers that are connected by valves of negligible volume. At the outset of an experiment, the valves are closed and the chambers contain the gases as detailed in the diagram. All the chambers are at the temperature of 300 K and external pressure of 1.0 atm
P subscript e x t end subscript equals 1.0 atm

What will be the work done by N subscript 2 end subscript gas when valve 2 is opened and value 1 remains closed?

chemistry-General
General
chemistry-

In simple cubic lattice, the spheres are packed in the form of a square array by laying down a base of spheres and then piling upon the base other layers in such a way that each sphere is immediately above the other sphere. In this structure, each sphere is in contact with six nearest neighbours. The percentage of occupied volume in this structure can be calculated as follows
The edge length ‘a’ of the cube will be twice the radius of the sphere, i e comma blank a equals 2 r. Since, in the primitive cubic lattice, there is only one sphere present in the unit lattice, the volume occupied by the sphere is

V equals fraction numerator 4 over denominator 3 end fraction pi r to the power of 3 end exponent or V equals fraction numerator 4 over denominator 3 end fraction pi open parentheses fraction numerator a over denominator 2 end fraction close parentheses to the power of 3 end exponent
The fraction of the total volume occupied by the sphere is
ϕ equals fraction numerator fraction numerator 4 over denominator 3 end fraction pi open parentheses fraction numerator a over denominator 2 end fraction close parentheses to the power of 3 end exponent over denominator a to the power of 3 end exponent end fraction equals fraction numerator pi over denominator 6 end fraction equals 0.5236 blank o r blank 52.36 percent sign
In a simple cubic cell, an atom at the corner contributes to the unit cell

In simple cubic lattice, the spheres are packed in the form of a square array by laying down a base of spheres and then piling upon the base other layers in such a way that each sphere is immediately above the other sphere. In this structure, each sphere is in contact with six nearest neighbours. The percentage of occupied volume in this structure can be calculated as follows
The edge length ‘a’ of the cube will be twice the radius of the sphere, i e comma blank a equals 2 r. Since, in the primitive cubic lattice, there is only one sphere present in the unit lattice, the volume occupied by the sphere is

V equals fraction numerator 4 over denominator 3 end fraction pi r to the power of 3 end exponent or V equals fraction numerator 4 over denominator 3 end fraction pi open parentheses fraction numerator a over denominator 2 end fraction close parentheses to the power of 3 end exponent
The fraction of the total volume occupied by the sphere is
ϕ equals fraction numerator fraction numerator 4 over denominator 3 end fraction pi open parentheses fraction numerator a over denominator 2 end fraction close parentheses to the power of 3 end exponent over denominator a to the power of 3 end exponent end fraction equals fraction numerator pi over denominator 6 end fraction equals 0.5236 blank o r blank 52.36 percent sign
In a simple cubic cell, an atom at the corner contributes to the unit cell

chemistry-General
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General
chemistry-

Sketch shows the plot of Zvsp for a hypothetical gas for one mole at
three distinct temperature


Boyle’s temperature is the temperature at which a gas shows ideal behaviour over a pressure range in the low pressure region. Boyle’s temperature left parenthesis T subscript b end subscript right parenthesis equals fraction numerator a over denominator R b end fraction. If a plot is obtained at temperature below Boyle’s temperature then the curve will show negative deviation in low pressure region and positive deviation in the high pressure region. Near critical temperature, the curve is more likely as C O subscript 2 end subscript and the temperature above critical temperature curve is more likeH subscript 2 end subscript at 0 ℃
For 500 K plot value of Z changes from 2 to 2.2 if pressure is varied from 1000 atm to 1200 atm (high pressure) then the value of fraction numerator b over denominator R T end fraction will be

Sketch shows the plot of Zvsp for a hypothetical gas for one mole at
three distinct temperature


Boyle’s temperature is the temperature at which a gas shows ideal behaviour over a pressure range in the low pressure region. Boyle’s temperature left parenthesis T subscript b end subscript right parenthesis equals fraction numerator a over denominator R b end fraction. If a plot is obtained at temperature below Boyle’s temperature then the curve will show negative deviation in low pressure region and positive deviation in the high pressure region. Near critical temperature, the curve is more likely as C O subscript 2 end subscript and the temperature above critical temperature curve is more likeH subscript 2 end subscript at 0 ℃
For 500 K plot value of Z changes from 2 to 2.2 if pressure is varied from 1000 atm to 1200 atm (high pressure) then the value of fraction numerator b over denominator R T end fraction will be

chemistry-General
General
physics-

In double slit experiment, the distance between two slits is 0.6 mm and these are illuminated with light of wavelength 4800 A0 The angular width of dark fringe on the screen at a distance 120 cm from slits will be

In double slit experiment, the distance between two slits is 0.6 mm and these are illuminated with light of wavelength 4800 A0 The angular width of dark fringe on the screen at a distance 120 cm from slits will be

physics-General
General
chemistry-

I, II, and III are three isotherms, respectively, at T subscript 1 end subscript comma blank T subscript 2 end subscript comma blank and T subscript 3 end subscript. Temperature will be in order

I, II, and III are three isotherms, respectively, at T subscript 1 end subscript comma blank T subscript 2 end subscript comma blank and T subscript 3 end subscript. Temperature will be in order

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