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Recent questions tagged quantum-mechanical-model
Questions
With what velocity must an electron travel so that its momentum is equal to that of a photon of wavelength $\lambda=5200A^{\large\circ}$?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q118
medium
cbse
ch2
structure-of-atom
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate momentum of radiations of wavelength 0.33nm
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q117
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Find the quantum no 'n' corresponding to the excited state of $He^+$ ion if on transition to the ground state that ion emits two photons in succession with wavelength 108.5 and 30.4nm
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q115
difficult
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate the uncertainty in velocity of a cricket ball (mass=0.15Kg) if its uncertainty position is of the order of $1A^{\large\circ}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q111
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
When a certain metal was irradiated with light of frequency $1.6\times 10^{16}Hz$,the photoelectrons emitted had twice the kinetic energy as did photoelectrons emitted when the same metal was irradiated with light of frequency $1.0\times 10^{16}$Hz.Calculate $V_0$(threshold frequency) for the metal.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q107
difficult
asked
Jan 16, 2014
by
sreemathi.v
1
answer
If uncertainties in the measurement of position and momentum are equal,calculate uncertainty in the measurement of velocity.
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q105
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate the uncertainty in velocity of an electron if uncertainty in its position is of the order of $1A^{\large\circ}$
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q102
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
An electron moves in an electric field with a kinetic energy of 2.5eV.What is the associated De-Broglie wavelength?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q101
medium
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate the accelerating potential that must be imparted to a proton beam to give it an effective wavelength of 0.005nm.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q100
difficult
asked
Jan 16, 2014
by
sreemathi.v
1
answer
Calculate $\lambda$ of the radiations when the electrons jumps from III to II orbit for H atom.The electronic energy in II and III Bohr's orbit of H atom are $-5.42\times 10^{-12}$ and $-2.41\times 10^{-12}$erg respectively.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q98
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the momentum of electron moving with $\large\frac{1}{3}$rd velocity of light
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q97
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Electromagnetic radiations of wavelength 242nm is just sufficient to ionize sodium atom.Calculate the ionization energy of sodium in KJ/mol.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q89
difficult
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The ionization energy of $He^+$ is $19.6\times 10^{-18}J/atom$.Calculate the energy of first stationary state of $Li^{2+}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q88
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The ionization energy of H atom is $13.6eV$.What will be ionization energy of $He^+$ and $Li^{2+}$ ions?
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
quantum-mechanical-model
q87
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the velocity of an electron placed in $III$ orbit of H atom.Also calculate the no of revolution /sec round the nucleus.
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q86
difficult
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Calculate the energy required to excite one litre of hydrogen gas at 1atm and 298K to the first excited state of atomic hydrogen.The energy for the dissociation of H-H bond is $463KJmol^{-1}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q85
difficult
asked
Jan 15, 2014
by
sreemathi.v
1
answer
A bulb emits light of $\lambda=4500A^{\circ}$ .The bulb is rated as 150watt and 8% of the energy is emitted as light.How many photons are emitted by the bulb per second?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q84
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Iodine molecule dissociates into atoms after absorbing light of 4500$A^{\circ}$ .If one quantum of radiation is absorbed by each molecule,calculate the kinetic energy of iodine atoms (Bond energy of $I_2=240KJmol^{-1}$)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q83
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The number of radial nodes of 3s and 2p orbitals are respectively
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q82
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The quantum numbers $\large\frac{1}{2}$ and $-\large\frac{1}{2}$ for the electron spin represents :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q80
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Number of nodal plane in px-orbital is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q78
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The wavelength of a golf ball weighing 200g and moving with a speed of 5m/h is of the order :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q77
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The electronic configuration of an element is $1s^2,2s^22p^6,3s^23p^63d^5,4s^1$.This represents its
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q76
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The electrons,identified by quantum number n and l,(i) n=4,l=1;(ii) n=4,l=0;(iii) n=3,l=2;(iv) n=3,l=1 can be placed into order of increasing energy,from the lowest to highest,as :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q75
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
The energy of an electron in the first orbit of H-atom is -13.6eV.The possible value of excited state for electron in bohr orbit of H atom are :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q74
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
For a d electron,the orbital angular momentum is :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q72
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
Which has maximum number of unpaired electron :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q71
medium
asked
Jan 15, 2014
by
sreemathi.v
1
answer
A 3p-orbital has :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q70
medium
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Calculate the wavelength (in nanometer) associated with a proton moving $1.0\times 10^3ms^{-1}$ (mass of proton=$1.67\times 10^{-27}$kg and $h=6.63\times 10^{-34}Js)$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q69
medium
asked
Jan 13, 2014
by
sreemathi.v
1
answer
In an atom,an electron is moving with a speed of 600m/s with an accuracy of 0.005%.Certainly with which the position of the electron can be located is ($h=6.6\times 10^{-34}kg)m^2s^{-1}$.mass of electron,$e_m=9.1\times 10^{-31}kg)$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q68
medium
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The ionization enthalpy of hydrogen atom is $1.312\times 10^6\;Jmol^{-1}$.The energy required to excite the electron in the atom from $n=1$ to $n=2$ is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q67
medium
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Which of the following sets of quantum numbers represents the highest energy of an atom?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q66
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The "spin-only" magnetic moment [in units of Bohr magneton,$(\mu_B)$] of $Ni^{2+}$ in aqueous solution would be (Atomic no Ni=28)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q65
medium
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Which of the following statement is correct in relation to the hydrogen atom?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q63
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
In a multi-electron atom,which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic field.\[\] $\begin{array}{1 1}(i)\;n=1,l=0,m=0\\(ii)\;n=2,l=0,m=0\\(iii)\;n=2,l=1,m=1\\(iv)\;n=3,l=2,m=1\\(v)\;n=3,l=2,m=0\end{array}$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q62
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Of the following outer electronic configurations of atoms,the highest oxidation state is achieved by which one of them
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q61
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The number of electrons with the azimuthal quantum number $l=1$ 1nd $l=2$ in ground state of $_{24}Cr$ is respectively :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q59
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Which set is correct for an electron in $4f-$orbital?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q58
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The orbital angular momentum for an electron resolving in an orbit is $\large\frac{h}{2\pi}$$\sqrt{l(l+1)}$.This momentum of a $s$-electron is :
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q55
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The number of d-electrons retained in $Fe^{2+}$ ion is :
sat
atomic-structure
jeemain
chemistry
physical-chemistry
unit2
quantum-mechanical-model
q54
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Which has the maximum magnetic moment
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q53
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Uncertainty in position of a minute particle of mass 25g in space is $10^{-5}$m.The uncertainty in its velocity (in $ms^{-1})$ is
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q52
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
In a hydrogen atom,if energy of an electron in ground state is -13.6eV,then that in the $2^{nd}$ excited state is :
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q51
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The quantum number that does not describe the distance and the angular disposition of the electron
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q50
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Kcrypon ($36_Kr)$ has the electronic configuration $(_{18}Ar)4s^23d^{10}4p^6$,the $37^{th}$ electron will go into which of the following subshells?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q49
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
The electronic configuration $1s^2,2s^2p^6,3s^13p^1$ correctly describes :
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q48
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
An ion with 18 electrons in the outermost shell is :
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q47
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Among the following series of transition metals ions,the one where all metal ions have $3d^2$ electronic configuration is
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q46
easy
asked
Jan 13, 2014
by
sreemathi.v
1
answer
Which of the following statement is (are) correct ?
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q45
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
Which atom has as many as s-electron and p-electrons?
sat
atomic-structure
jeemain
chemistry
physical-chemistry
class11
unit2
quantum-mechanical-model
q44
easy
asked
Jan 10, 2014
by
sreemathi.v
1
answer
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