11. Which of the following would have a permanent dipole moment? (a) Si F 4 (b) S F 4 (c) X e F 4 (d) B F 3 Ans : (b) S F 4 12. Which of the following molecule/ion does not contain unpaired electrons ? (a) N molecule (b) O 2 + 2 electron (c) O 2 (d) B molecule Ans : (b) O 2 + 2 electron 13. The percentage ionic character of a bond having 1.275 Å its length and 1.03 D its dipole moment is: (a) 10% (b) 15% (c) 16.83% (d) 18.8%. Ans : (c) 16.83% 14 . The angle between covalent bonds is maximum in (a) C H 4 (b) B F 3 (c) P F 3 (d) N H 3 Ans : (b) B F 3 15. The percentage character of the hybrid orbitals in methane, ethene and ethyne are (a) 25, 50, 75 (b) 25, 33,75 (c) 25, 33, 50 (d) 100, 50, 25 Ans : (c) 25, 33, 50 16. Carbon dioxide is iso structural with (a) Tin chloride (b) Zinc chl...
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