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Class 11 Chemistry
Structures Of Atom
Quiz 1
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The increasing order (lowest first) for the values of e/m (charge/mass) for
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e, p, n, α
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n, p, e, α
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n, p, α, e
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n, α, p, e
Explanation
n, α, p, e
The ionization enthalpy of hydrogen atom is312 × 10J mol. The energy required to excite the electron in the atom from n = 1 to n = 2 is
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8. 51 × 10J mol
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6. 56 × 10J mol
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7. 56 × 10J mol
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9. 84 × 10J mol
Explanation
9. 84 × 10J mol
or a given principal level n = 4, the energy of its subshells is in the order
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s < p < d < f
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s > p > d > f
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s < p < f < d
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f < p < d < s
Explanation
s < p < d < f
A gas absorbs a photon of 355 nm and emits at two wavelengths. If one of the emissions is at 680 nm, the other is at:
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518 nm
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1035 nm
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325 nm
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743 nm
Explanation
743 nm
Which of the following statements in relation to the hydrogen atom is correct?
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3s orbital is lower in energy than 3p orbital
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3p orbital is lower in energy than 3d orbital
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3s and 3p orbitals are of lower energy than 3d orbital
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3s, 3p and 3d orbitals all have the same energy
Explanation
3s, 3p and 3d orbitals all have the same energy
The magnetic quantum number specifies
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Size of orbitals
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Shape of orbitals
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Orientation of orbitals
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Nuclear Stability
Explanation
Orientation of orbitals
The electronic configuration of silver atom in ground state is
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[Kr]3d4s
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[Xe]4f5d6s
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[Kr]4d5s
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None of the above
Explanation
[Kr]4d5s
Which of the following element has least number of electrons in its M-shell?
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K
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Mn
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Ni
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Sc
Explanation
K
Which one of the following sets of ions represents a collection of isoelectronic species? (Atomic nos. : F = 9, Cl = 17, Na = 11, Mg = 12, Al = 13, K = 19, Ca = 20, Sc = 21)
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K, Ca, Sc, Cl
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Na, Ca, Sc, F
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K, Cl, Mg, Sc
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Na, Mg, Al, Cl
Explanation
K, Ca, Sc, Cl
In the ground state, an element has 13 electrons in its M-shell. The element is_____.
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Copper
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Chromium
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Nickel
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Iron
Explanation
Chromium
The electrons of the same orbitals can be distinguished by
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Principal quantum number
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Azimuthal quantum number
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Spin quantum number
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Magnetic quantum number
Explanation
Spin quantum number
Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, l = 1 and 2 are, respectively:
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12 and 4
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12 and 5
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16 and 4
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16 and 5
Explanation
12 and 5
In Hydrogen atom, energy of first excited state is –4 eV. Then find out KE of same orbit of Hydrogen atom
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3. 4 eV
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6. 8 eV
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-13. 6 eV
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+13. 6 eV
Explanation
3. 4 eV
Which of the following sets of quantum numbers represents the highest energy of an atom?
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n = 3, l = 0, m = 0, s = + \(\frac {1}{2}\)
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n = 3, l = 1, m = 1, s = + \(\frac {1}{2}\)
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n = 3, l = 2, m = 1, s = + \(\frac {1}{2}\)
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n = 4, l = 0, m = 0, s = + \(\frac {1}{2}\)
Explanation
n = 3, l = 2, m = 1, s = + \(\frac {1}{2}\)
In the Bohrs model of the hydrogen atom, the ratio of the kinetic energy to the total energy of the electron in a quantum state n is:
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1
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2
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-1
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-2
Explanation
-1
Which of the following statements does not form a part of Bohrs model of hydrogen atom?
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Energy of the electrons in the orbit is quantised
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The electron in the orbit nearest the nucleus has the lowest energy
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Electrons revolve in different orbits around the nucleus
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The position and velocity of the electrons in the orbit cannot be determined simultaneously
Explanation
The position and velocity of the electrons in the orbit cannot be determined simultaneously
A sub-shell with n = 6 , l = 2 can accommodate a maximum of
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12 electrons
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36 electrons
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10 electrons
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72 electrons
Explanation
10 electrons
A body of mass 10 mg is moving with a velocity of 100 ms. The wavelength of de-Broglie wave associated with it would be (Note: h =63 × 10Js)
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6. 63 × 10 m
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6. 64 × 10 m
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(i) and (ii)
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None of the above
Explanation
6. 63 × 10 m
0 h : 0 m : 1 s
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