7. For which of the following species are the dispersion forces strongest? A. C4

Question

7. For which of the following species are the dispersion forces strongest? A. C4Hio CoH14 Which of the following can form hydrogen bonds with water molecules? 8. I. Na II. CH3COOH III. C2H IV. CH3NH2 I. and II. I. and III. II. and III. II. and IV III. and IV A. B. C. D. E. 9. Ammonia's unusually high melting point is the result of: A. B. C. dipole-dipole forces. London dispersion forces. hydrogen bonding covalent bonding. E. ionic bonding. 10. In hydrogen iodide are most important intermolecular forces. dipole-dipole forces London dispersion forces

Explanation / Answer

7(ans) C8H16

Reason - dispersion force means that how closely an atom pack together so larger the surface area larger the dispersion force so octane have larger dispersion force.

8(ans) II and IV

Reason- as hydrogen bonding is the bond between hydrogen bonded to more electronegative atom with an electronegative atom . So only II and IV is the correct answer.

9(ans) Hydrogen bonding

Reason-as ammonia is lighter than air,its density being .589 times that of air. It is easily liquified due to strong hydrogen bonding between molecules. So answer is hydrogen bonding.

19(ans) London dispersion forces

Reason-intermolecular means between different molecules.H-I bond is barely polar ,so dipole-dipole force would be very weak.so London dispersion force as being the most important.

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