Free NEET Chemistry multiple-choice questions on Quantum Mechanical Model. Attempt each question and reveal the answer with a full explanation.
The orientation of an atomic orbital is governed by which quantum number? Magnetic quantum number Principal quantum number Azimuthal quantum number Spin quantum number What is the maximum number of electrons in an atom that can have the following set of quantum numbers: n=4, l=3, m=+2, s=+1/2 ? 1 2 6 14 The total number of nodes in a 4p orbital is: 3 2 1 4 The total number of atomic orbitals in the fourth energy level of an atom is: 16 8 4 32 What is the correct set of four quantum numbers for the valence electron of a Rubidium atom ( Z = 37 )? 5, 0, 0, +1/2 5, 1, 0, +1/2 5, 1, 1, +1/2 6, 0, 0, +1/2 How many subshells are associated with n = 4 ? 4 3 2 1 What is the maximum number of electrons that can be associated with the following set of quantum numbers: n=3, l=1, m l=-1 ? 2 6 10 1 Which of the following quantum numbers determines the orientation of the orbital in space? Magnetic quantum number ( m l ) Principal quantum number ( n ) Azimuthal quantum number ( l ) Spin quantum number ( m s ) The number of angular nodes for a 4f orbital is: 3 4 0 1 Which of the following subshells does not exist according to quantum mechanics? 2d 4f 5g 3p Which of the following is correct for an electron with the quantum numbers n=4, l=2, m l=+1, m s=+ 1 2 ? The electron is in a 4d orbital. The electron is in a 4p orbital. The electron is in a 4f orbital. The electron is in a 4s orbital. The total number of orbitals associated with the principal quantum number n=3 is: 9 4 16 3 The orientation of an atomic orbital is governed by:- Azimuthal quantum number Spin quantum number Magnetic quantum number Principal quantum number Maximum number of electrons in a subshell or an atom is determined by the following : 2n 2 4l+2 2l+2 4l-2 Which of the following is not permissible arrangement of electrons in an atom ? n=3, l=2, m=-3, s=- 1 2 n=4, l=0, m=0, s=- 1 2 n=5, l=3, m=0, s=+ 1 2 n=3, l=2, m=-3, s= 1 2 What is the maximum numbers of electrons that can be associated with the following set of quantum numbers? n = 3 , l = 1 and m = -1 10 6 4 2 What is the maximum number of orbitals that can be identified with the following quantum numbers? n = 3, = 1, m = 0 1 2 3 4 Two electrons occupying the same orbital are distinguished by Principal quantum number Magnetic quantum number Azimuthal quantum number Spin quantum number The total number of orbitals present for principle quantum number, n = 4 is 30 12 15 16 The relation between n m , ( n m = the number of permissible values of magnetic quantum number (m)) for a given value of azimuthal quantum number (l), is l = n m - 1 2 l = 2n m + 1 n m = 2l + 1 n m = l + 2 Match List I with List II array ll List I (Quantum Number) & List II (Information provided) A. m l & I. Shape of orbital B. m s & II. Size of orbital C. l & III. Orientation of orbital D. n & IV. Orientation of spin of electron array Choose the correct answer from the options given below : A-I, B-III, C-II, D-IV A-III, B-IV, C-I, D-II A-III, B-IV, C-II, D-I A-II, B-I, C-IV, D-III Match List I with List II : array lllll ; & List I (Quantum Numbers) 'n' & 'l' & ; & List II (Orbital) A. & 2 & 1 & I. & 3d B. & 4 & 0 & II. & 2p C. & 5 & 3 & III. & 4s D. & 3 & 2 & IV. & 5f array Choose the correct answer from the options given below. A-II, B-III, C-IV, D-I A-I, B-II, C-III, D-IV A-II, B-III, C-I, D-IV A-IV, B-II, C-III, D-I What is the maximum number of orbitals that can be identified with the following quantum numbers? n=3, l=1, m l=0 1 2 3 4 What is the orbital angular momentum of an electron in a d -orbital? √6 ℏ √2 ℏ √3 ℏ Zero Which of the following sets of quantum numbers is NOT possible for an electron in an atom? n=3, l=2, m l=-3, m s=+ 1 2 n=4, l=0, m l=0, m s=- 1 2 n=5, l=3, m l=0, m s=+ 1 2 n=2, l=1, m l=-1, m s=- 1 2 In the plot of radial probability ( 4 r 2 2 ) vs distance ( r ) from the nucleus for a 2s orbital, how many peaks (maxima) are observed? 2 1 3 0 What is the total number of nodes (radial + angular) in a 4d orbital? 3 4 2 1 Among the following, which orbital has the highest energy? 5f 6p 7s 6d Which of the following quantum numbers is not derived from the Schrödinger wave equation? Spin quantum number ( s ) Principal quantum number ( n ) Azimuthal quantum number ( l ) Magnetic quantum number ( m l ) How many electrons in an atom of Zinc ( Z=30 ) have the azimuthal quantum number l=0 ? 8 6 10 12 Which of the following sets of quantum numbers represents the highest energy orbital in a multi-electron atom? n=4, l=1, m=+1, s=+1/2 n=4, l=0, m=0, s=+1/2 n=3, l=2, m=0, s=-1/2 n=3, l=1, m=-1, s=+1/2 The number of radial nodes and angular nodes for a 4d orbital are respectively: 1 and 2 2 and 1 2 and 2 3 and 0 What is the maximum number of electrons that can be accommodated in an atom with quantum numbers n=4, l=2, m l=-1 ? 2 10 6 1 The wave function for an atomic orbital is a solution to the Schrodinger equation. The physical significance of | | 2 is: Probability density of finding the electron at a point The energy of the electron in the orbital The distance of the electron from the nucleus The velocity of the electron in that orbital The orbital angular momentum of a p -electron is given by the expression: 2 h 2 h 2 6 h 2 h 2 Which of the following orbitals has the maximum number of radial nodes? 6s 5p 4d 3f Which of the following sets of quantum numbers represents the electron with the lowest energy in a multi-electron atom? n=3, l=0, m l=0, m s=+ 1 2 n=3, l=1, m l=0, m s=+ 1 2 n=3, l=2, m l=0, m s=+ 1 2 n=4, l=0, m l=0, m s=+ 1 2 The total number of nodes (radial + angular) in a 5f orbital is: 4 5 3 2 Consider the following sets of quantum numbers: array ccccc & n & l & m & s ( i ) & 3 & 0 & 0 & +1/2 ( ii ) & 2 & 2 & 1 & +1/2 ( iii ) & 4 & 3 & -2 & -1/2 ( iv ) & 1 & 0 & -1 & -1/2 ( v ) & 3 & 2 & 3 & +1/2 array Which of the following sets of quantum number is not possible? (i), (ii), (iii) and (iv) (ii), (iv) and (v) (i) and (iii) (ii), (iii) and (iv) 4d, 5p, 5f and 6p orbitals are arranged in the order of decreasing energy. The correct option is 5f > 6p > 4d > 5p 5f > 6p > 5p > 4d 6p > 5f > 5p > 4d 6p > 5f > 4d > 5p The orbital angular momentum of an electron in a 4f orbital is: 2 h h 2 h 3h 2 h h 2 h 3 2 How many electrons in a ground-state Manganese atom ( Z=25 ) have the magnetic quantum number m l = 0 ? 11 13 9 15 The magnetic quantum number ( m l ) for an orbital defines: The spatial orientation of the orbital The size of the orbital The shape of the orbital The spin of the electron For a given value of azimuthal quantum number l=3 , the possible values of magnetic quantum number m l are: -3, -2, -1, 0, +1, +2, +3 0, 1, 2, 3 -2, -1, 0, +1, +2 -3, -2, -1, +1, +2, +3 The angular momentum of an electron in a d -orbital is given by: 6 2 0 3 The maximum number of electrons in a subshell is given by the expression: 4l + 2 4l - 2 2l + 1 2n 2 The quantum number which determines the shape of the orbital is: Azimuthal quantum number Principal quantum number Magnetic quantum number Spin quantum number