Q.1
Which of the following has maximum number of unpaired electrons
  • a)Cu2+
  • b) Cr3+
  • c)Ni2+
  • d)Fe3+
Q.2
Assertion : In a multielectron atom, the electrons in different sub-shells have different energies. Reason : Energy of an orbital depends upon n + l value.
  • a) Both Assertion and Reasoning are true and Reasoning is correct explanation of Assertion
  • b) Both are correct but Reason is not explanation of Assertion
  • c) Assertion is correct but Reason is wrong
  • d) Both Assertion and Reason are incorrect.
Q.3
Isoelectronic species are
  • a) CO, CN–, NO+, C22–
  • b) CO–, CN, NO, C2–
  • c) CO+, CN+, NO–, C2
  • d) CO, CN, NO, C2
Q.4
The ratio of the energy required to remove an electron from the first three Bohr’s orbits of hydrogen is
  • a) 3 : 2 : 1
  • b) 9 : 4 : 1
  • c) 36 : 9 : 4
  • d) 1 : 4 : 9
Q.5
Be2+ is isoelectronic with which of the following ions ? [AIPMT-2014]
  • a) H+
  • b) Li+
  • c) Na+
  • d) Mg2+
Q.6
Assertion : The charge to mass ratio of the particles in anode rays depends on nature of gas taken in the discharge tube. Reason : The particles of anode rays carry positive charge.
  • a) Both Assertion and Reasoning are true and Reasoning is correct explanation of Assertion
  • b) Both are correct but Reason is not explanation of Assertion
  • c) Assertion is correct but Reason is wrong
  • d) Both Assertion and Reason are incorrect.
Q.7
If the uncertainty in the position of 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.8
Which of the following is not permissible arrangement of electrons in an atom? [AIPMT (Prelims)-2009]
  • a) n = 5, l = 3, m = 0, s =1/2
  • b) n = 3, l = 2, m = –3, s = -1/2
  • c) n = 3, l = 2, m = –2, s = -1/2
  • d) n = 4, l = 0, m = 0, s = +1/2
Q.9
Which one of the elements with the following outer orbital configurations may exhibit the largest number of oxidation states? [AIPMT (Prelims)-2009]
  • a) 3d5, 4s1
  • b) 3d5, 4s2
  • c) 3d2, 4s2
  • d) 3d3, 4s2
Q.10
Which one of the following ions has electronic configuration [Ar]3d6? (At. nos. Mn = 25, Fe = 26, Co = 27, Ni = 28)
  • a) Co3+
  • b) Ni3+
  • c) Mn3+
  • d) Fe3+
Q.11
If n = 6, the correct sequence of filling of electrons will be [AIPMT (Prelims)-2011]
  • a) ns → np →(n - 1)d →(n - 2)f
  • b) ns →(n - 2)f →(n -1)d→ np
  • c) ns →(n - 1)d →(n - 2)f → np
  • d) ns → (n - 2)f → np → (n - 1)d
Q.12
What will be the ratio of the wavelength of the first line to that of the second line of Paschen series of H atom?
  • a) 256 : 175
  • b) 175 : 256
  • c) 15 : 16
  • d) 24 : 27
Q.13
Which of the following statement concerning the four quantum number is incorrect?
  • a) n gives the size of an orbital
  • b) l gives the shape of an orbital
  • c) m gives the energy of the electron in orbital
  • d) s gives the direction of spin of electron in the orbital
Q.14
The energy of second Bohr orbit of the hydrogen atom is –328 kJ mol–1; hence the energy of fourth Bohr orbit would be [AIPMT (Prelims)-2005]
  • a) –41 kJ mol–1
  • b) –1312 kJ mol–1
  • c) –164 kJ mol–1
  • d) –82 kJ mol–1
Q.15
he geometry of sp3d2 hybrid orbitals is
  • a) linear
  • b) pentagonal bipyramidal
  • c)trigonal bipyramidal
  • d)octahedral
Q.16
The d-orbitals involved in dsp2 hybridization is
  • a) dxy
  • b) dz2
  • c) dx2 - y2
  • d) dzx
Q.17
Assertion : Electronic energy for hydrogen atom of different orbitals follow the sequence : 1s < 2s = 2p < 3s = 3p = 3d. Reason : Electronic energy for hydrogen atom depends only on n and is independent of ‘l’ & ‘m’ values.
  • a) Both Assertion and Reasoning are true and Reasoning is correct explanation of Assertion
  • b) Both are correct but Reason is not explanation of Assertion
  • c) Assertion is correct but Reason is wrong
  • d) Both Assertion and Reason are incorrect.
Q.18
A transition element X has a configuration (Ar)3d4 in its +3 oxidation state. Its atomic number is
  • a) 22
  • b) 19
  • c) 25
  • d) 26
Q.19
What will be the longest wavelength line in Balmer series of spectrum of H-atom?
  • a) 546 nm
  • b) 656 nm
  • c) 566 nm
  • d) 556 nm
Q.20
Zeeman effect refers to the
  • a) Splitting of the spectral lines in a magnetic field
  • b) Splitting up of the spectral lines in an electrostatic field
  • c) Emission of electrons from metals when light falls on it
  • d) Random scattering of α-particles by gold foil
Q.21
Assertion : The number of angular nodes in 3zd2 is zero. Reason : Number of angular nodes of atomic orbitals is equal to value of l.
  • a) Both Assertion and Reasoning are true and Reasoning is correct explanation of Assertion
  • b) Both are correct but Reason is not explanation of Assertion
  • c) Assertion is correct but Reason is wrong
  • d) Both Assertion and Reason are incorrect.
Q.22
Which of the following set of quantum number is possible?
  • a) n = 4, l = 2, m = –2, s = –2
  • b) n = 4, l = 4, m = 0, s =1/2
  • c) n = 4, l = 3, m = –3, s =1/2
  • d) n = 4, l = 0, m = 0, s = 0
Q.23
If kinetic energy of a proton is increased nine times, the wavelength of the de-Broglie wave associated with it would become
  • a) 3 times (2) (3)
  • b) 9 times
  • c) (1/3) times
  • d) (1/6) times
Q.24
Two electrons in K shell will not have
  • a) Same principal quantum number
  • b) Same azimuthal quantum number
  • c) Same magnetic quantum number
  • d) Same spin quantum number
Q.25
The momentum of a particle which has a de-Broglie wavelength of 0.1 nm is
  • a) 3.2 × 10⁻²⁴ kg ms–1
  • b) 4.3 × 10⁻²² kg ms–1
  • c) 5.3 × 10⁻²² kg ms–1
  • d) 6.62 × 10⁻²⁴ kg ms–1
Q.26
An electron jumps from lower orbit to higher orbit, when
  • a) Energy is released
  • b) Energy is absorbed
  • c) No change in energy
  • d) It radiates energy
Q.27
For a ‘p’ electron, the orbital angular momentum is
  • a) √6 ħ
  • b) √2 ħ
  • c) ħ
  • d) 2 ħ
Q.28
The total number of subshells in fourth energy level of an atom is
  • a) 4
  • b) 8
  • c) 16
  • d) 32
Q.29
Total number of spectral lines in UV region, during transition from 5th excited state to 1st excited state
  • a) 10
  • b) 3
  • c) 4
  • d) zero
Q.30
Which of the following electronic in a transition hydrogen atom will require the largest amount of energy?
  • a) n = 1 to n = 2
  • b) n = 2 to n = 3
  • c) n = 1 to n = ∞
  • d) n = 3 to n = 5
Q.31
Which combinations of quantum numbers n, l, m and s for the electron in an atom does not provide a permissible solutions of the wave equation?
  • a) 3, 2, 2, 1/2
  • b) 3, 3, 1, -1/2
  • c) 3, 2, 1, 1/2
  • d) 3, 1, 1,-1/2
Q.32
The number of radial nodes in 4s and 3p orbitals are respectively
  • a) 2, 0
  • b) 3, 1
  • c) 2, 2
  • d) 3, 2
Q.33
Which shell would be the first to have ‘g’ sub-shell?
  • a) L
  • b) M
  • c) N
  • d) O
Q.34
Maximum number of electrons in a subshell with l = 3 and n = 4 is [AIPMT (Prelims)-2012]
  • a) 10
  • b) 12
  • c) 14
  • d) 16
Q.35
Assertion : The orbitals having equal energy are known as degenerate orbitals. Reason : The three 2p orbitals are degenerate in the presence of external magnetic field.
  • a) Both Assertion and Reasoning are true and Reasoning is correct explanation of Assertion
  • b) Both are correct but Reason is not explanation of Assertion
  • c) Assertion is correct but Reason is wrong
  • d) Both Assertion and Reason are incorrect.
Q.36
Among the following which one is not paramagnetic? [Atomic numbers; Be = 4, Ne = 10, As = 33, Cl = 17]
  • a) Ne2+
  • b) Be+
  • c) Cl–
  • d) As+
Q.37
The de Broglie wavelength of a particle with mass 1 g and velocity 100 m/s is
  • a) 6.63 × 10⁻³⁵ m
  • b) 6.63 × 10⁻³⁴ m
  • c) 6.63 × 10⁻³³ m
  • d) 6.65 × 10⁻³⁵ m
Q.38
Number of spectral lines falling in Balmer series when electrons are de-excited from nth shell will be given as
  • a) (n – 2) in UV
  • b) (n – 2) in visible region
  • c) (n – 3) in near IR
  • d) (n – 3) in far IR
Q.39
Electronic energy is negative because
  • a) Electron has negative charge
  • b) Energy is zero near the nucleus and decreases as the distance from nucleus increases
  • c) Energy is zero at infinite distance from the nucleus and decreases as the electron comes towards nucleus
  • d) These are interelectronic repulsions
Q.40
The electronic configuration of gadolinium (Atomic No. 64) is
  • a) [Xe]4f3 5d5 6s2
  • b) [Xe]4f 6 5d2 6d2
  • c) [Xe]4f8 5d9 6s2
  • d) [Xe] 4f 7 5d1 6s2
Q.41
The energies E1and E2 of two radiations are 25 eV and 50 eV respectively. The relation between their wavelengths i.e. λ1 and λ2 will be
  • a) λ1 = λ2/2
  • b) λ1 = λ2
  • c) λ1 = 2λ2
  • d) λ1 = 4λ2
Q.42
The correct order of energy difference between adjacent energy levels in H atom
  • a) E2– E1 > E3– E2 > E4– E3
  • b) E2– E1 > E4 – E3 > E3 – E2
  • c) E4 – E3 > E3 – E2 > E2– E1
  • d) E3 – E2 > E4– E3 > E2 – E1
Q.43
In the presence of magnetic field, the possible number of orientations for an orbital of azimuthal quantum number 3, is
  • a) Three
  • b) One
  • c) Five
  • d) Seven
Q.44
Maximum number of electrons in a subshell of an atom is determined by the following [AIPMT (Prelims)-2009]
  • a) 2l+1
  • b) 4l- 2
  • c) 2n2
  • d) 4l + 2
Q.45
The orbital angular momentum of electron in 4s orbital is
  • a) h/4π
  • b) zero
  • c) h/2π
  • d) 2.5h/2π
Q.46
Which of the following electronic configuration is not possible?
  • a) 2p3
  • b) 2d5
  • c) 4s1
  • d) 5f8
Q.47
on Q199) Consider the following sets of quantum numbers Which of the following sets of quantum number is not possible? [AIPMT (Prelims)-2007]
Sr n l m s
(a) 3 0 0 +1/2
(b) 2 2 1 +1/2
(c) 4 3 –2 3 -2 -1/2
(d) 1 0 –1 0 -1 -1/2
(e) 3 2 3 +1/2
  • a) a and c
  • b) b, c and d
  • c) a, b, c and d
  • d) b, d and e
Q.48
Assertion : K.E. of two subatomic particles, having same de-Broglie’s wavelength is same. Reason : de-Broglie’s wavelength is directly related to mass of subatomic particles.
  • a) Both Assertion and Reasoning are true and Reasoning is correct explanation of Assertion
  • b) Both are correct but Reason is not explanation of Assertion
  • c) Assertion is correct but Reason is wrong
  • d) Both Assertion and Reason are incorrect.
Q.49
If uncertainty in position and momentum are equal, then uncertainty in velocity is [AIPMT (Prelims)-2008]
  • a)
    ch-1_qn-201choice_img_no1.png
  • b)
    ch-1_qn-201choice_img_no2.png
  • c)
    ch-1_qn-201choice_img_no3.png
  • d)
    ch-1_qn-201choice_img_no4.png
Q.50
The ratio of specific charge of an electron to that of a proton is
  • a) 1 : 1
  • b) 1837 : 1
  • c) 1 : 1837
  • d) 2 : 1
0 h : 0 m : 1 s