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NEET Chemistry MCQ
Structure Of Atom Mcq Neet Chemistry
Quiz 1
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Q.1
Which one of the following shows correct configuration of the outermost shell in inert gas?
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a)ns2, np6
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b) ns2, np3
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c)ns2, np5
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d)ns2, np4
Explanation
Answer:(a)
Q.2
The electronic configuration of 1s2, 2s2, 2p3, 3s2, 3p2 corresponding to [ EAMCET 1981]
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a) Si
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b) S
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c)Na
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d)Ar
Explanation
Answer: (a)
Q.3
Electron configuration of calcium atom can be written as
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a)[Ne], 4p2
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b) [ Ar], 4s2
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c)[Ne], 4s2
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d)[Kr], 4p2
Explanation
Answer: (b)
Q.4
The frequency in sec-1 of a radiation having a wavelength of 1000Å is ....
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a) 3.3 ×10-15
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b) 3.0 ×10-13
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c)1 ×105
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d)3.0 ×1015
Explanation
Answer:(d)
Q.5
Which of the following has maximum magnetic moment?
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a) Mn2+ ( Z=25)
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b) Fe (Z=26)
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c)Fe2+ (Z=26)
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d)Cr3+ (Z=24)
Explanation
Mn2+ ha maximum unpaired electrons hence maximum magnetic momentAnswer: (a)
Q.6
Which of the following is incorrect about de Broglie relationship
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a) h=λ × p
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b)
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c)
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d)
Explanation
Answer: (d)
Q.7
The radial wave function depends on
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a) Principal quantum number only
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b) Azimuthal quantum number only
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c) Both on principal and azimuthal quantum numbers
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d) Azimuthal and magnetic quantum numbers
Explanation
Radial wave functions for a given atom depend only upon the distance, r from the nucleus. therefore radial part of wave function depends on the quantum numberAnswer: (a)
Q.8
the energy of an electron in an atomic orbital of hydrogen like species depends on
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a) the principal quantum number only
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b) the principal and azimuthal quantum numbers only
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c) the principal, azimuthal and magnetic quantum number
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d) the principal, azimuthal, magnetic and spin quantum number
Explanation
The energy of an electron in a hydrogen atom is determined only by the principal quantum number. Thus, the energy of the orbitals increases as follows: 1s<2s = 2p<3s = 3p = 3d <4s = 4p = 4d= 4f Answer: (a)
Q.9
Which of the following has largest de Broglie wavelength given that all have equal velocity
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a)CO2 molecule
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b) NH3 molecule
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c)Electron
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d)Proton
Explanation
Since electron have smallest mass in given option and wavelength ∝ (1/m) if velcity is constantAnswer: (c)
Q.10
The photoelectric emission from surface starts only when the light incident upon the surface has certain minimum
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a) intensity
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b) wavelength
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c)velocity
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d)frequency
Explanation
Answer: (d)
Q.11
The element with electronic configuration [Ar]3d54s1 belongs to ( in periodic table)
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a)Group1
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b) Group6
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c)group 16
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d)Group4
Explanation
Group number is 6 as outermost orbit have 6 electronsAnswer: (b)
Q.12
The energy of an electron in an atomic orbital of a multi electron depends on
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a) the principal quantum number only
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b) the principal and azimuthal quantum numbers only
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c) the principal, azimuthal quantum number and magnetic quantum number only
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d)the principal, azimuthal quantum number, magnetic quantum number and spin quantum number
Explanation
The energy of orbital in these types of atoms is dependent on both principal quantum number (n) or shells and azimuthal quantum number (l) or subshells. Answer:(b)
Q.13
The number of protons, neutrons and electrons in 175Lu71, respectively, are .... .. [NEET 2020]
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a) 71, 71 and 104
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b) 175, 104 and 71
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c)71, 104 and 71
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d) 104, 71 and 71
Explanation
Answer: (c)
Q.14
4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is ... .. [NEET 2019]
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a) 5f > 6p > 5p > 4d
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b) 6p > 5f > 5p > 4d
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c) 6p > 5f > 4d > 5p
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d) 5f > 6p > 4d > 5p
Explanation
Answer: (a)
Q.15
Which of the following series of transitions in the spectrum of hydrogen atom fall in visible region?
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a) Lyman series
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b) Balmer series
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c) Paschen series
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d) Brackett series
Explanation
Answer:(b)
Q.16
The spectrum produced by white light is
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a) Emission spectrum
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b) Continuous spectrum
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c) Absorption spectrum
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d)Both emission and continuous spectrum
Explanation
A continuous spectrum contains many different colors, or wavelengths, with no gaps. Perfectly white light shined through a prism causes dispersion of the light, and we see a rainbow. when a gas is heated, the atoms in the gas absorb the energy and emit light, and an emission spectrum results. Answer: (b)
Q.17
Which of the following is not correct according to Plank's quantum theory?
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a)Energy is emitted or absorbed discontinuously
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b) Energy of a quantum is directly proportional to its frequency
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c)A photon is also a quantum of light
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d)Energy less than quantum can also be emitted or absorbed
Explanation
Answer: (d)
Q.18
An isotone of 76Ge32 is
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a) 77Ge32
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b) 77As33
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c)77Se34
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d)81Kr36
Explanation
Answer: (b)
Q.19
Most of elements have fractional atomic masses because
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a) they have isotopes
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b) their isotopes have different masses
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c)their isotopes have non integral masses
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d)the constituent neutrons, protons and electrons combine to give fractional masses
Explanation
Answer:(b)
Q.20
Electron energy in atom is negative because
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a) electron carries negative charge
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b) energy is zero near the nucleus and decreases as the distance from the nucleus increases
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c) energy is zero at infinite distance from the nucleus and decreases as the electron comes closer to the nucleus
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d) there are inter-electronic repulsions
Explanation
Answer: (c)
Q.21
In hydrogen spectrum, the series of line appearing in ultra violet region of electromagnetic spectrum are called
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a)Lyman lines
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b) Balmer lines
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c)Pfund lines
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d)Brackett lines
Explanation
Answer: (a)
Q.22
Bohr's orbital's are called stationary because
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a) Electrons in them are stationary
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b) their orbits have fixed radii
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c)the electrons in them have fixed energy
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d)the protons remains in the nuclei and are stationary
Explanation
Answer: (c)
Q.23
The wavelength of spectral line for an electronic transition is inversely related to
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a) the number of electrons undergoing transition
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b) the nuclear charge of the atom
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c)the difference in the energy levels involved in transition
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d)the velocity of electron undergoing transition
Explanation
ΔE=hν and ν ∝ (1/λ) Answer:(c)
Q.24
The number of electrons in an atom of an element is equal to its
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a) atomic weight
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b) atomic number
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c) Equivalent weight
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d) Electron affinity
Explanation
Answer: (b)
Q.25
The value of Rydber constant is
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a)1.09678 ×107 cm-1
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b) 1.09678 ×107 m-1
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c)1.09678 ×10-7 cm-1
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d)1.09678 ×10-7 m-1
Explanation
Answer: (b)
Q.26
Transition of an electron from n=3 to n=2 level results in line
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a) the infra-red spectrum
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b) in the visible spectrum
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c)in the ultraviolet spectrum
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d)in the far infrared spectrum
Explanation
Answer: (b)
Q.27
The total energy of the electron atom is
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a) Less than zero
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b) greater than zero
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c)0
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d)less or more than zero
Explanation
Answer:(a)
Q.28
Neutron is present in all atoms except
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a) He
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b) H
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c) C
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d) Ne
Explanation
Answer: (b)
Q.29
Bohr's atomic model is based upon
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a)HEisenberg's uncertainty principle
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b) de Broglie concept of dual character of matter
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c)Schrodenger wave equation
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d)Plank's quantum theory
Explanation
Answer: (d)
Q.30
Isobars have same number of
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a) protons
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b) electrons
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c)neutrons
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d)nucleons
Explanation
Answer: (d)
Q.31
Ne, Na+ and F- have same
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a) mass number
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b) number of nucleons
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c)number of electrons
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d)number of protons
Explanation
electrons in Ne=10 in Na+=11 -1=10 in F-=9 + 1=10 Answer:(c)
Q.32
The spectral line obtained when an electron jumps from n=6 to n=2 level in hydrogen atom belongs to the
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a) Balmer series
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b) Lyman series
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c) Paschen series
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d) Pfund series
Explanation
Answer: (a)
Q.33
Which of the following series of lines in the atomic spectrum of hydrogen atom appears in the visible region?
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a)Lyman
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b)Paschen
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c)Brackett
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d)Balmer
Explanation
Answer: (d)
Q.34
Line spectra is characteristic of
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a) molecule
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b) atoms
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c)radicals
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d)none of these
Explanation
Answer: (b)
Q.35
he total number of neutrons in dipositive zinc ion with mass number 70 is
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a) 34
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b) 40
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c)36
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d)38
Explanation
For zinc atomic number=30 A=n + z 70=n +30 Answer:(b)
Q.36
Value of planck's constant is
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a) 6.626 ×10-34 Js
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b) 6.023 × 1023> Js
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c) 6.626 ×10-27 Js
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d) 6.626 × 10-24Js
Explanation
Answer: (a)
Q.37
Ratio of radii of second and third Bohr orbits of hydrogen atom is
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a) 2 : 3
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b) 3 : 2
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c) 4 : 9
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d) 9 : 4
Explanation
as rn ∝ n2 Thus r2 / r3=4/9 Answer: (c)
Q.38
If the uncertainty in the position of an electron is zero, the uncertainty in its momentum would be
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a)zero
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b) greater than h/4π
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c)less than h/4π
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d)infinite
Explanation
Answer: (d)
Q.39
ohr model failed of the advent of
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a)Planck's quantum theory
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b) Electromagnetic wave theory
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c)Heisenberg's uncertainty principle
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d)Photoelectric effect
Explanation
Like Einstein’s theory of the photoelectric effect, Bohr’s formula assumes that during a quantum jump, a discrete amount of energy is radiated. However, unlike Einstein, Bohr stuck to the classical Maxwell theory of the electromagnetic field. Quantization of the electromagnetic field was explained by the discreteness of the atomic energy levels. Bohr did not believe in the existence of photons.Answer: (d)
Q.40
Which of the following is false regarding Bohr's model
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a) It introduces the idea of stationary states
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b) It explains the line spectrum of hydrogen atom
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c)It gives the probability of the electron near the nucleus
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d)It predicts that the angular momentum of electron in H-atom=n(h/2π)
Explanation
Answer: (c)
Q.41
Which of the following has more electrons than neutrons
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a) Al3+
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b) C
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c)O2-
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d)F
Explanation
Answer:(c)
Q.42
The limiting line in Paschen series corresponds to
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a) n1=2 and n2=3
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b) n1=3 and n2=4
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c) n1=3 and n2=10
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d) n1=3 and n2=∞
Explanation
Answer: (d)
Q.43
The isotones of an element differ in
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a)The number of neutrons in the nucleus
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b) The charge on the nucleus
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c)The number of extra nuclear electrons
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d)both the nuclear charge and the number of extra-nuclear electrons
Explanation
Answer: (b)
Q.44
hich amongst the following transition will give Lyman series in hydrogen line spectrum
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a) K to L
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b) L to M, N etc
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c)L, M. N to K
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d)K to L, M, N
Explanation
Lyman series is a hydrogen spectral series of transitions and resulting ultraviolet emission lines of the hydrogen atom as an electron goes from n ≥ 2( L, M, N) to n = 1 (K)(where n is the principal quantum number),Answer: (c)
Q.45
The equation E=hν is put forward by
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a) Einstein
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b) Planck
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c)Maxwell
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d)Schrodinger
Explanation
Answer:(b)
Q.46
When electron revolves in stationary orbits
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a) There is no change in energy level
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b) They becomes stationary
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c) They are gaining kinetic energy
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d) There is increase in energy
Explanation
Answer: (a)
Q.47
In which case the wavelength emitted is minimum
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a)An electron jumps from 2nd to 1st level
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b) An electron jumps from 3rd to 2nd level
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c)An electron jumps from 4th to 3rd level
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d)An electron jumps from 5th to 4th level
Explanation
E2 - E1 is maximum hence ν is maximum or λ is minimum Answer: (a)
Q.48
The spectrum produced from an element is
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a) Atomic spectrum
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b) Line spectrum
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c)Absorption spectrum
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d)any one of the above
Explanation
element can have any of the above spectraAnswer: (d)
Q.49
Which of the following is not a unit of frequency
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a) sec-1
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b) Hertz
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c)Cycles sec-1
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d)k Hz sec-1
Explanation
Answer:(d)
Q.50
Which property of the element is whole number
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a) Atomic mass
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b) Mass number
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c) Atomic size
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d) Ionization potential
Explanation
Answer: (b)
0 h : 0 m : 1 s
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