Chemistry-
General
Easy

Question

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 ?

  1. Alum is a double salt.    
  2. EDTA salt of calcium is used in the treatment of lead poisoning.    
  3. Effective atomic number of the metals in complexes [Ni(CO)4] and [Fe(CN)6] 4– is same.    
  4. Chloridotr is (triphenylphosphine) rhodium(I) is effective heterogeneous catalyst for hydrogenation of alkenes.    

The correct answer is: Chloridotr is (triphenylphosphine) rhodium(I) is effective heterogeneous catalyst for hydrogenation of alkenes.

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

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

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

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

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The complexes given below show : and 

The complexes given below show : and 

chemistry-General
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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
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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?

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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
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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
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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
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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
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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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V vs T curves at different pressures P subscript 1 end subscript and P subscript 2 end subscript for an ideal gas are shown below:

Which one of the following is correct?

V vs T curves at different pressures P subscript 1 end subscript and P subscript 2 end subscript for an ideal gas are shown below:

Which one of the following is correct?

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In a YDSE shown in Fig a parallel beam of light is incident on the slits from a medium of refractive index n1 The wavelength of light in this medium is l1 A transparent slab of thickness ‘t’ and refractive index n3 is put in front of one slit The medium between the screen and the plane of the slits is n2 The phase difference between the light waves reaching point “O” (symmetrical, relative to the slits) is

In a YDSE shown in Fig a parallel beam of light is incident on the slits from a medium of refractive index n1 The wavelength of light in this medium is l1 A transparent slab of thickness ‘t’ and refractive index n3 is put in front of one slit The medium between the screen and the plane of the slits is n2 The phase difference between the light waves reaching point “O” (symmetrical, relative to the slits) is

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In Young’s double slit experiment S subscript 1 end subscript text  and  end text S subscript 2 end subscript are two slits Films of thickness t subscript 1 end subscript text  and  end text t subscript 2 end subscript and refractive indices mu subscript 1 end subscript text  and  end text mu subscript 2 end subscript are placed in front of S subscript 1 end subscript text  and  end text S subscript 2 end subscript respectively If mu subscript 1 end subscript t subscript 1 end subscript equals mu subscript 2 end subscript t subscript 2 end subscript, then the central maximum will

In Young’s double slit experiment S subscript 1 end subscript text  and  end text S subscript 2 end subscript are two slits Films of thickness t subscript 1 end subscript text  and  end text t subscript 2 end subscript and refractive indices mu subscript 1 end subscript text  and  end text mu subscript 2 end subscript are placed in front of S subscript 1 end subscript text  and  end text S subscript 2 end subscript respectively If mu subscript 1 end subscript t subscript 1 end subscript equals mu subscript 2 end subscript t subscript 2 end subscript, then the central maximum will

physics-General
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