Q.1
Which one of the following shows correct configuration of the outermost shell in inert gas?
  • a)ns2, np6
  • b) ns2, np3
  • c)ns2, np5
  • d)ns2, np4
Q.2
The electronic configuration of 1s2, 2s2, 2p3, 3s2, 3p2 corresponding to [ EAMCET 1981]
  • a) Si
  • b) S
  • c)Na
  • d)Ar
Q.3
Electron configuration of calcium atom can be written as
  • a)[Ne], 4p2
  • b) [ Ar], 4s2
  • c)[Ne], 4s2
  • d)[Kr], 4p2
Q.4
The frequency in sec-1 of a radiation having a wavelength of 1000Å is ....
  • a) 3.3 ×10-15
  • b) 3.0 ×10-13
  • c)1 ×105
  • d)3.0 ×1015
Q.5
Which of the following has maximum magnetic moment?
  • a) Mn2+ ( Z=25)
  • b) Fe (Z=26)
  • c)Fe2+ (Z=26)
  • d)Cr3+ (Z=24)
Q.6
Which of the following is incorrect about de Broglie relationship
  • a) h=λ × p
    ch-1_qn-78choice_img_no2.png
  • b)
    ch-1_qn-78choice_img_no3.png
  • c)
    ch-1_qn-78choice_img_no4.png
  • d)
Q.7
The radial wave function depends on
  • a) Principal quantum number only
  • b) Azimuthal quantum number only
  • c) Both on principal and azimuthal quantum numbers
  • d) Azimuthal and magnetic quantum numbers
Q.8
the energy of an electron in an atomic orbital of hydrogen like species depends on
  • a) the principal quantum number only
  • b) the principal and azimuthal quantum numbers only
  • c) the principal, azimuthal and magnetic quantum number
  • d) the principal, azimuthal, magnetic and spin quantum number
Q.9
Which of the following has largest de Broglie wavelength given that all have equal velocity
  • a)CO2 molecule
  • b) NH3 molecule
  • c)Electron
  • d)Proton
Q.10
The photoelectric emission from surface starts only when the light incident upon the surface has certain minimum
  • a) intensity
  • b) wavelength
  • c)velocity
  • d)frequency
Q.11
The element with electronic configuration [Ar]3d54s1 belongs to ( in periodic table)
  • a)Group1
  • b) Group6
  • c)group 16
  • d)Group4
Q.12
The energy of an electron in an atomic orbital of a multi electron depends on
  • a) the principal quantum number only
  • b) the principal and azimuthal quantum numbers only
  • c) the principal, azimuthal quantum number and magnetic quantum number only
  • d)the principal, azimuthal quantum number, magnetic quantum number and spin quantum number
Q.13
The number of protons, neutrons and electrons in 175Lu71, respectively, are .... .. [NEET 2020]
  • a) 71, 71 and 104
  • b) 175, 104 and 71
  • c)71, 104 and 71
  • d) 104, 71 and 71
Q.14
4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is ... .. [NEET 2019]
  • a) 5f > 6p > 5p > 4d
  • b) 6p > 5f > 5p > 4d
  • c) 6p > 5f > 4d > 5p
  • d) 5f > 6p > 4d > 5p
Q.15
Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?
  • a) Lyman series
  • b) Balmer series
  • c) Paschen series
  • d) Brackett series
Q.16
The spectrum produced by white light is
  • a) Emission spectrum
  • b) Continuous spectrum
  • c) Absorption spectrum
  • d)Both emission and continuous spectrum
Q.17
Which of the following is not correct according to Plank's quantum theory?
  • a)Energy is emitted or absorbed discontinuously
  • b) Energy of a quantum is directly proportional to its frequency
  • c)A photon is also a quantum of light
  • d)Energy less than quantum can also be emitted or absorbed
Q.18
An isotone of 76Ge32 is
  • a) 77Ge32
  • b) 77As33
  • c)77Se34
  • d)81Kr36
Q.19
Most of elements have fractional atomic masses because
  • a) they have isotopes
  • b) their isotopes have different masses
  • c)their isotopes have non integral masses
  • d)the constituent neutrons, protons and electrons combine to give fractional masses
Q.20
Electron energy in atom is negative because
  • a) electron carries negative charge
  • b) energy is zero near the nucleus and decreases as the distance from the nucleus increases
  • c) energy is zero at infinite distance from the nucleus and decreases as the electron comes closer to the nucleus
  • d) there are inter-electronic repulsions
Q.21
In hydrogen spectrum, the series of line appearing in ultra violet region of electromagnetic spectrum are called
  • a)Lyman lines
  • b) Balmer lines
  • c)Pfund lines
  • d)Brackett lines
Q.22
Bohr's orbital's are called stationary because
  • a) Electrons in them are stationary
  • b) their orbits have fixed radii
  • c)the electrons in them have fixed energy
  • d)the protons remains in the nuclei and are stationary
Q.23
The wavelength of spectral line for an electronic transition is inversely related to
  • a) the number of electrons undergoing transition
  • b) the nuclear charge of the atom
  • c)the difference in the energy levels involved in transition
  • d)the velocity of electron undergoing transition
Q.24
The number of electrons in an atom of an element is equal to its
  • a) atomic weight
  • b) atomic number
  • c) Equivalent weight
  • d) Electron affinity
Q.25
The value of Rydber constant is
  • a)1.09678 ×107 cm-1
  • b) 1.09678 ×107 m-1
  • c)1.09678 ×10-7 cm-1
  • d)1.09678 ×10-7 m-1
Q.26
Transition of an electron from n=3 to n=2 level results in line
  • a) the infra-red spectrum
  • b) in the visible spectrum
  • c)in the ultraviolet spectrum
  • d)in the far infrared spectrum
Q.27
The total energy of the electron atom is
  • a) Less than zero
  • b) greater than zero
  • c)0
  • d)less or more than zero
Q.28
Neutron is present in all atoms except
  • a) He
  • b) H
  • c) C
  • d) Ne
Q.29
Bohr's atomic model is based upon
  • a)HEisenberg's uncertainty principle
  • b) de Broglie concept of dual character of matter
  • c)Schrodenger wave equation
  • d)Plank's quantum theory
Q.30
Isobars have same number of
  • a) protons
  • b) electrons
  • c)neutrons
  • d)nucleons
Q.31
Ne, Na+ and F- have same
  • a) mass number
  • b) number of nucleons
  • c)number of electrons
  • d)number of protons
Q.32
The spectral line obtained when an electron jumps from n=6 to n=2 level in hydrogen atom belongs to the
  • a) Balmer series
  • b) Lyman series
  • c) Paschen series
  • d) Pfund series
Q.33
Which of the following series of lines in the atomic spectrum of hydrogen atom appears in the visible region?
  • a)Lyman
  • b)Paschen
  • c)Brackett
  • d)Balmer
Q.34
Line spectra is characteristic of
  • a) molecule
  • b) atoms
  • c)radicals
  • d)none of these
Q.35
he total number of neutrons in dipositive zinc ion with mass number 70 is
  • a) 34
  • b) 40
  • c)36
  • d)38
Q.36
Value of planck's constant is
  • a) 6.626 ×10-34 Js
  • b) 6.023 × 1023> Js
  • c) 6.626 ×10-27 Js
  • d) 6.626 × 10-24Js
Q.37
Ratio of radii of second and third Bohr orbits of hydrogen atom is
  • a) 2 : 3
  • b) 3 : 2
  • c) 4 : 9
  • d) 9 : 4
Q.38
If the uncertainty in the position of an electron is zero, the uncertainty in its momentum would be
  • a)zero
  • b) greater than h/4π
  • c)less than h/4π
  • d)infinite
Q.39
ohr model failed of the advent of
  • a)Planck's quantum theory
  • b) Electromagnetic wave theory
  • c)Heisenberg's uncertainty principle
  • d)Photoelectric effect
Q.40
Which of the following is false regarding Bohr's model
  • a) It introduces the idea of stationary states
  • b) It explains the line spectrum of hydrogen atom
  • c)It gives the probability of the electron near the nucleus
  • d)It predicts that the angular momentum of electron in H-atom=n(h/2π)
Q.41
Which of the following has more electrons than neutrons
  • a) Al3+
  • b) C
  • c)O2-
  • d)F
Q.42
The limiting line in Paschen series corresponds to
  • a) n1=2 and n2=3
  • b) n1=3 and n2=4
  • c) n1=3 and n2=10
  • d) n1=3 and n2=∞
Q.43
The isotones of an element differ in
  • a)The number of neutrons in the nucleus
  • b) The charge on the nucleus
  • c)The number of extra nuclear electrons
  • d)both the nuclear charge and the number of extra-nuclear electrons
Q.44
hich amongst the following transition will give Lyman series in hydrogen line spectrum
  • a) K to L
  • b) L to M, N etc
  • c)L, M. N to K
  • d)K to L, M, N
Q.45
The equation E=hν is put forward by
  • a) Einstein
  • b) Planck
  • c)Maxwell
  • d)Schrodinger
Q.46
When electron revolves in stationary orbits
  • a) There is no change in energy level
  • b) They becomes stationary
  • c) They are gaining kinetic energy
  • d) There is increase in energy
Q.47
In which case the wavelength emitted is minimum
  • a)An electron jumps from 2nd to 1st level
  • b) An electron jumps from 3rd to 2nd level
  • c)An electron jumps from 4th to 3rd level
  • d)An electron jumps from 5th to 4th level
Q.48
The spectrum produced from an element is
  • a) Atomic spectrum
  • b) Line spectrum
  • c)Absorption spectrum
  • d)any one of the above
Q.49
Which of the following is not a unit of frequency
  • a) sec-1
  • b) Hertz
  • c)Cycles sec-1
  • d)k Hz sec-1
Q.50
Which property of the element is whole number
  • a) Atomic mass
  • b) Mass number
  • c) Atomic size
  • d) Ionization potential
0 h : 0 m : 1 s