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Atomic Structure Test - 15

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Atomic Structure Test - 15
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  • Question 1
    1 / -0

    Electronic configuration of the element having atomic number 24.

    Solution

    Atomic no 24 is of Cr. Due to half filled orbital stability it doesnot follow Afbau rule so its configuration is 

  • Question 2
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    The atom with the given atomic number Z=17, and the atomic mass A=35.5 is

    Solution

    The element with atomic number(Z) 17 & mass number (A) 35 is chlorine = 

  • Question 3
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    Correct expression for mass number A is

    Solution

    Mass no. = no. of protons + no. of neutrons.

  • Question 4
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    According to quantum mechanics ψ2(r) the wave function squared gives

    Solution

    ψ has no physical significance while ψ2 represnts the probability density of finding an electron.

  • Question 5
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    Spin quantum number with two spin states of the electron represented by two arrows, ↑ (spin up) and ↓ (spin down) was introduced to account for

    Solution

    In anomalous Zeeman effect the splitting of spectral lines occurs due to interaction of the applied magnetic field with the magnetic moment generated by the orbital and 'spin' motions of the electron.

  • Question 6
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    Values of e/m (charge/mass) in the categories alpha particle (α), electron (e) and protons (p) increase in the order:

    Solution

    E/m values of particle (α), electron (e) and protons (p) increase in the order a< p < e

  • Question 7
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    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: 

    Solution

  • Question 8
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    The electronic configuration 1s22s22p1 belongs to

    Solution

    It is of boron as it has atomic number 5.

  • Question 9
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    The energy associated with the first orbit in the hydrogen atom is -2.18 x 10−18 J/atom. What is the energy associated with the fifth orbit?

    Solution

    Energy for any n shell = -2.18 x 10−18 )/n'2 (') stands for raise to the power of therefore, E associated with 5 orbit = -2.18 x 10−18/52 = -2.18 × 10-18/25 = -218 × 10-20/25 = -8.72 x 10-20J/atom

  • Question 10
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    Isobars are the atoms with

    Solution

    Isobars are the atoms with same mass number but different atomic number.

  • Question 11
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    Due to the presence of electrons in the inner shells, the electron in the outer shell will not experience the full positive charge of the nucleus (Ze). This is known as

    Solution

    This is known as shielding effect. Inner lying electrons shields the positive charge reaching the outer most electrons.

  • Question 12
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    Maximum number of electrons in a subshell with l = 3 and n = 4 is

    Solution

    In this question l=3 means the sub shell is f & n=4 means it is present in 4th orbit.
    Finally it is a 4f sub shell.
    The no of orbital in f sub shell =2l+1
                                                    = 2*3+1
                                                    =7
    Each orbital can accommodate 2 electrons.
      7*2 = 14 electrons.

    Maximum number of electrons in a sub shell with l=3& n=4 (4f) is 14electrons.

  • Question 13
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    Arrange the electrons present in the 4d, 3d, 4p and 3p orbitals in order of increasing energies

    Solution

    Energy of orbital is determined by n+l value. The orbital having higher n+l value will have higher energy. If n+l value is same then orbital having higher n value will have higher energy.

  • Question 14
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    Isotopes are the atoms with

    Solution

    Isotopes have same atomic no. but different mass no.

  • Question 15
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    The Aufbau principle states : In the ground state of the atoms, the orbitals are filled in order of

    Solution

    According to Aufbau rule electrons are filled in increasing order of energy.

  • Question 16
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    Radio frequency region of the electromagnetic spectrum is used for broadcasting. It is

    Solution

    Radio frequency region is present around 106106 Hz.

  • Question 17
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    In an atom, an electron is moving with a speed of 600m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is (h = 6.6 ×10−34 Js)

    Solution

     

  • Question 18
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    Give the name and atomic number of the inert gas atom in which the total number of d-electrons is equal to the difference between the numbers of total p and total s electrons.

    Solution

    It is Krypton .
    Electronic configuration:  1s22s22p63s23p64s23d104p6
    ​Number of electrons in s orbital are 8
    Number of electrons in p orbital are 18
    Number of electrons in d orbitals are 10 (18-8=10)

  • Question 19
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    Photoelectric effect established that light

    Solution

    Photoelectric effect proves the particle nature of light.

  • Question 20
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    According to Pauli’s exclusion principle

    Solution

    Paulis exclusion principle stated that no two electron can have same set of all the four quantum nos.

  • Question 21
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    One of the orbitals is non-directional

    Solution

    s orbital is spherically symmetrical hence non directional.

  • Question 22
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    The ionization energy of the lowest state, also called as the ground state, is:

    Solution

    For hydrogen atom =  2.18 x 10−18J atom−1 =−E1(H)

  • Question 23
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    An cation A3+ has 18 electrons. Write the atomic number of A.

    Solution

    3+ charge means no of electrons will be 3 less than no. of protons. So no. of protons will be 21. So atomic no. is 21.

  • Question 24
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    Emission spectrum of a material results from the material's (atom or molecules)

    Solution

    Emission spectrum is recorded when a electron de excites from higher energy level to ground state.

  • Question 25
    1 / -0

    Dalton's atomic theory could not explain one of the following

    Solution

    Dalton’s atomic theory stated that atoms were indivisible. However, the discovery of subatomic particles (such as protons, electrons, and neutrons) disproved this postulate.

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