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JEE Questions for Chemistry Structure Of Atom Quiz 6 - MCQExams.com
JEE
Chemistry
Structure Of Atom
Quiz 6
According to Somerfield’s model, only circular orbit is possible for the electron in
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K shell
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L shell
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M shell
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N shell
According to Bohr’s atomic model
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electron on H atom can have only certain values of angular momentum
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electrons have a particle as well as wave character
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atomic spectrum of atom should contain only five lines
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all the above statements are correct
The transition of electrons inH atom that will emit maximum energy is
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2)
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The wavelength of a spectral line for electron transition is inversely related to
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Z (nuclear charge)
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velocity of electron
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number of electrons undergoing transition
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the energy difference between the energy levels involving transition
The phenomenon of splitting of spectral lines under the influence of the electric field is known as
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Photoelectric effect
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Stark effect
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Zeeman effect
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Electromagnetic effect
If ionising energy of H atom is 13.6 eV, then the second ionising energy of He should be
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13.6eV
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27.2eV
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54.4 eV
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Cannot be predicted
How many electrons in
19
K have n = 3;
l
= 0?
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1
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2
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4
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3
In an atom which has 2K, 8L, 8M and 2N electrons in the ground state, the total number of electrons having = 1are
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20
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8
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12
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10
The number of electrons that can be accommodated in d
xy
orbital is
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10
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4
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1
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2
The electronic configuration of Mn can be written as
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[Ar] 4s2
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[Ar] 3d6, 4s2
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[Ar] 3d5, 4s1
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[Ar] 3d5, 4s2
Which of the following sets of quantum numbers is not possible for 23rd electron of Cr( At. no.?
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3, 2, +2, –1⁄2
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3, 2, -2, +1⁄2
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3, 2, + 1, +1⁄2
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3, 1, + 1, +1⁄2
Which d – orbital does not have four lobes?
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dx2 – y2
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dxy
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dyz
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dzx
The total number of electrons present in any main energy level can be calculated from
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(2l + 1)
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2n2
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(2n+1)
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n2
Which shape is associated with the orbital designated by n = 2; / = 1 ?
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spherical
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tetrahedral
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dumb – bell
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pyramidal
Which of the following statements about quantum numbers is wrong?
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If the value of l = 0, the electron distribution is spherical
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The shape of the orbital is given by subsidiary quantum number
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The Zeeman’s effect is explained by magnetic quantum number
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The spin quantum number gives the orientations of electron cloud
The two electrons have the following sets of quantum numbers . X: 3, 2, –2, +1⁄2 Y : 3, 0, 0, +1⁄2. What is true of the following?
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X and Y have same energy
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X and Y have unequal energy
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X and Y represent same electron
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None of the statements is correct
If the value of azimuthal quantum number of an electron is 2, then which of the following values of magnetic quantum numbers is not permissible,
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3
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2
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0
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1
The fundamental particles which arc responsible for keeping nucleons together is
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Meson
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Antiproton
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Positron
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Electron
The positron is as heavy as
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electron
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neutron
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alpha particle
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proton
Atoms may be regarded as comprising of protons, electrons and neutrons. If the mass attributed to the neutrons were halved and that attributed to electrons were doubled then atomic mass of would
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remain approximately the same
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be doubled
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Approximately be halved
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be reduced by approximately 25%
How many electrons in an atom with atomic number 105 can have (n +
l
) = 8 ?
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30
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17
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15
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Unpredictable
The size of the nucleus is approximately
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1/100th of the atom
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1/1000 th of the atom
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1/10000th of the atom
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1/l00000th of the atom
The line spectrum ot two elements is not identical because
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they do not have same number of neutrons
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they have dissimilar mass number
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they have different energy level schemes
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they have different number of valence electrons
Bohr’s atomic model can explain the spectrum of
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hydrogen atoms only
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atoms or ions which are uni electron
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atoms or ions which have only two electrons
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hydrogen molecule
The electronic configuration of a dipositive ion M
+2
is 2, 8, 14 and its mass number is 56. The number of neutrons present is
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32
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42
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30
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34
An atom has 2 K, 8 L, 11 M, 2 N electrons, the total number of s – electrons will be
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6
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8
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10
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4
In an atom with 2K, 8L, 11M and 2N electrons the number of electrons with m = 0 ; s = + 1⁄2 are
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2
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7
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8
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16
For a sub – shell with azimuthal quantum number
l
, the total values of magnetic quantum number m can be related to
l
as
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m = ( +2)
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m = (22 + 2)
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l= 2m+1.
An orbital with = 0 is
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symmetrical about X – axis only
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symmetrical about Y – axis only
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spherically symmetrical
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unsymmetrical
The relationship between energy E, of the radiation with a wavelength 8000 Å and the energy of the radiation with a wavelength 16000 Å is
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E1 = 6E2
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E1 = 2E2
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E1 = 4E2
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E1 = 1/2E2
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