Tiêu đề 02. STRUCTURE OF ATOM.pdf ✅

PAPER 1 (1.) Select the incorrect statement : (1) The size of the orbitals increases with increase in n . (2) The region where probability density function reduces to zero is called node. (3) 4 f orbital has I = 4 (4) For single electron species, energy of the orbitals depends only on n . (2.) Choose the correct statement among the following: (1) All the d-orbitals have same shape (2) The energy of 4 s is less than 3 d for H -atom (3) For 3 p subshell, n = 3 , l=1 (4) All are correct (3.) The orbital angular momentuam for 3 p electron is : (1) 2 h (2) h 2 (3) 1.5 h  (4) 3 h 2 (4.) In Bohrs orbit nh 2 indicates : (1) momentum (2) kinetic energy (3) potential energy (4) angular momentum (5.) The radial nodes in 3 s and 5 p orbitals are respectively : (1) 2,2 (2) 3,2 (3) 3,3 (4) 2,3 (6.) How many maximum electrons can be associated with following quantum numbers : n = = = − 4, I 2, m 1 (1) 10 (2) 5 (3) 1 (4) 2 (7.) Which electronic configuration violates Hunds as well as Pauli's rule : (1) (2) (3) (4) (8.) Nodal planes for 4 2 Z d orbital is / are : (1) 2 (2) 1 (3) 3 (4) 0 (9.) Statement I : Angular momentum of an electron is quantized.
Statement II : In an atom only those orbits are allowed where angular momentum is a multiple of 2 h  . (1) Both statements I and II are correct. (2) Both statements I and II are incorrect. (3) Statement I is correct, statement II is incorrect. (4) Statement I is incorrect, statement II is correct. (10.) How many electrons in an atom may have the following quantum numbers i. n s = = − 4, 1/ 2 ii. n = = 3,1 0 (1) 32,2 (2) 16,9 (3) 32,9 (4) 16,2 (11.) Arrange the electrons represented by the following sets of quantum numbers in the decreasing order of energy: i. n 4,l 2, m 1, s 1/ 2 = = = − = + ii. n l m s = = = = + 4, 0, 0, 1/ 2 iii. n l m s = = = + = + 3, 2, 1, 1/ 2 iv n l m s = = = = + 3, 1, 0, 1/ 2 (1) 4 3 4 3 d d s p    (2) 3 4 3 4 p s d d    (3) 4 4 3 3 s d p d    (4) 3 3 4 4 p d s d    (12.) In which of the following electronic distribution (ground state) only Hund's rule is violated : (1) (2) (3) (4) (13.) The maximum number of electrons in a subshell for which l=3 is (1) 14 (2) 10 (3) 8 (4) 4 (14.) For a given principal energy level n = 4 ,the energy of its sub-shells is of the order (1) s  d  f  p (2) s  p  d  f (3) d  f  p  s (4) s  p  f  d (15.) Which of the following sets of quantum numbers is correct for an electronin 4f- orbital : (1) 1 3,l 2, m 2, s 2 n = = = − = + (2) 1 n 4,l 4, m 4, s 2 = = = − = − (3) 1 n 4,l 3, m 1, s 2 = = = + = + (4) 1 n 4,l 3, m 4, s 2 = = = + = +
(16.) In uncertainty in position and momentum are equal, then uncertainty in velocity is : (1) 1 2 h m  (2) 2 h  (3) 1 h m  (4) h  (17.) If n = 6 , the correct sequence for filling of electron will be : (1) ns → (n-2)f → (n-1)d → np (2) ns n 1 d n 2 f np → − → − → ( ) ( ) (3) ns n 2 f np n 1 d → − → → − ( ) ( ) (4) ns n d n f → − → − ( 1 2 ) ( ) (18.) The process of separation of an organic compound from its aqueous solution by shaking with a suitable solvent is termed solvent extraction or differential extraction. The organic compound present in the aqueous layer moves to the organic solvent because : (1) the organic substance is more soluble in the organic solvent. (2) organic compound being lighter moves in the upper layer (3) organic solvent is insoluble in water hence organic compound moves up (4) from the supersaturated aqueous solution the solute startsdiffusing (19.) Select the incorrect statement : (1) The size of the orbitals increases with increase in n . (2) The region where probability density function reduces to zero is called node. (3) 4 f orbital has I = 4 (4) For single electron species, energy of the orbitals depends only on n . (20.) Choose the correct statement among the following: (1) All the d-orbitals have same shape (2) The energy of 4 s is less than 3 d for H -atom (3) For 3 p subshell, n = 3 , l=1 (4) All are correct (21.) The orbital angular momentuam for 3 p electron is : (1) 2 h (2) h 2 (3) 1.5 h  (4) 3 h 2
(22.) In Bohrs orbit nh 2 indicates : (1) momentum (2) kinetic energy (3) potential energy (4) angular momentum (23.) The radial nodes in 3 s and 5 p orbitals are respectively : (1) 2,2 (2) 3,2 (3) 3,3 (4) 2,3 (24.) How many maximum electrons can be associated with following quantum numbers : n = = = − 4, I 2, m 1 (1) 10 (2) 5 (3) 1 (4) 2 (25.) Which electronic configuration violates Hunds as well as Pauli's rule : (1) (2) (3) (4) (26.) Nodal planes for 4 2 Z d orbital is / are : (1) 2 (2) 1 (3) 3 (4) 0 (27.) Statement I : Angular momentum of an electron is quantized. Statement II : In an atom only those orbits are allowed where angular momentum is a multiple of 2 h  . (1) Both statements I and II are correct. (2) Both statements I and II are incorrect. (3) Statement I is correct, statement II is incorrect. (4) Statement I is incorrect, statement II is correct. (28.) How many electrons in an atom may have the following quantum numbers i. n s = = − 4, 1/ 2 ii. n = = 3,1 0 (1) 32,2 (2) 16,9 (3) 32,9 (4) 16,2 (29.) Arrange the electrons represented by the following sets of quantum numbers in the decreasing order of energy: i. n 4,l 2, m 1, s 1/ 2 = = = − = + ii. n l m s = = = = + 4, 0, 0, 1/ 2 iii. n l m s = = = + = + 3, 2, 1, 1/ 2 iv n l m s = = = = + 3, 1, 0, 1/ 2