STRUCTURE OF ATOM Test

STRUCTURE OF ATOM

This is STRUCTURE OF ATOM Test-05 for CBSE class 12 Chemistry.. There are 15 questions in this test with each question having around four answer choices.

Questions & Answers

1
Given a spectral line of the Balmer series, what happens when the electron in a hydrogen atom undergoes transition from an energy level with n = 4 to an energy level with n = 2?
  • A
    lines appear in the infrared spectral region
  • B
    lines appear in the ultraviolet spectral region
  • C
    lines appear in the microwave spectral region
  • D
    lines appear in the visible spectral region
    Correct
2
Bohr’s model of atom explains spectrum of
  • A
    carbon
  • B
    Hydrogen
    Correct
  • C
    deuterium
  • D
    oxygen
3
The product of the uncertainties of the exact position and exact momentum (or velocity) of an electron. The product of their uncertainties is always
  • A
    equal to or greater than h/ π
  • B
    equal to or greater than h/2π
  • C
    equal to or greater than h/4π.
    Correct
  • D
    equal to or greater than h/3π
4
The product of the uncertainties of the exact position and exact momentum (or velocity) of an electron. The product of their uncertainties is always
  • A
    equal to or greater than h/2π
  • B
    equal to or greater than h/3π
  • C
    equal to or greater than h/4π.
    Correct
  • D
    equal to or greater than h/ π
5
Using s,p,d and f notation, choose the orbital with n=4, l=3 quantum numbers
  • A
    4d
  • B
    3d
  • C
    4p
  • D
    4f
    Correct
6
An element with mass number 81 contains 31.7 % more neutrons as compared to protons. Assign the atomic symbol.
  • A
    ${}_{35}^{81}{\text{S}}$
  • B
    ${}_{35}^{81}{\text{Ag}}$
  • C
    ${}_{35}^{81}{\text{Cl}}$
  • D
    ${}_{35}^{81}{\text{Br}}$
    Correct
7
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?
  • A
    -8.72 ×$10^{-20}$ Js
    Correct
  • B
    -5.72 ×$10^{-20}$ Js
  • C
    -3.72 ×$10^{-20}$ Js
  • D
    -7.72 ×$10^{-20}$ Js
8
Arrange the electrons present in the 4d, 3d, 4p and 3p orbitals in order of increasing energies
  • A
    (4d) < (4p) < (3p) < (3d)
  • B
    (3p) < (3d) < (4p) < (4d).
    Correct
  • C
    (3d) < (3p) < (4p) < (4d)
  • D
    (4p) < (4d) < (3p) < (3d)
9
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.
  • A
    As ( atomic no.=36)
  • B
    Br ( atomic no.=36
  • C
    Cl ( atomic no.=36)
  • D
    Kr ( atomic no.=36)
    Correct
10
An cation A3+ has 18 electrons. Write the atomic number of A.
  • A
    24
  • B
    15
  • C
    12
  • D
    21
    Correct
11
Among the following pairs of orbitals which orbital will experience the larger effective nuclear charge? (i) 2s and 3s, (ii) 4d and 4f, (iii) 3d and 3p:
  • A
    4f, 3d, and 3s respectively
  • B
    2s, 4d and 3d respectively
  • C
    4d, 3p and 2s respectively
  • D
    2s, 4d and 3p respectively
    Correct
12
What will be the wavelength of a ball of mass 0.1 kg moving with a velocity of 10 m $s^{-1}$. ?
  • A
    6.326 × $10^{-34}$ m (J = kg $m^2$ $s^-2$.)
  • B
    6.626 × $10^{-34}$ m (J = kg $m^2$ $s^-2$.)
    Correct
  • C
    6.266 × $10^{-34}$ m (J = kg $m^2$ $s^-2$.)
  • D
    6.696 × $10^{-34}$ m (J = kg $m^2$ $s^-2$.)
13
Which of the following sets of quantum numbers represents the highest energy of an atom?
  • A
    n = 3, l = 0, m = 0, s = +1/ 2
  • B
    n = 3, l = 1, m = 1, s = +1/ 2
  • C
    n = 4, l = 0, m = 0, s = +1/ 2
  • D
    n = 3, l = 2, m = 1, s = +1/ 2
    Correct
14
An electron beam undergoes diffraction. This wave character of electrons is used in the making of
  • A
    fluorescence microscope
  • B
    Light microscope
  • C
    electron microscope
    Correct
  • D
    compound microscope
15
Lines in the hydrogen spectrum which appear in the ultraviolet region of the electromagnetic spectrum, then they are called as
  • A
    Bracket series
  • B
    Balmer series
  • C
    Lyman series
    Correct
  • D
    Pfund series,