17. A and X are different elements with different electronegativities. What choi

Question

17. A and X are different elements with different electronegativities. What choice below best describes t polarity of the bonds and molecule in a linear A-X-A? á polar molecule with polar bonds b. polar molecule with both polar and nonpolar bonds c. nonpolar molecule with polar bonds d. nonpolar molecule with nonpolar bonds 18. Characterize the bond that forms between Li (1.0) and O (3.5) a. polar covalent bond c. coordinate covalent bond b. nonpolar covalent bond d. ionic bond 19. Choose the correct number of nonbonding electrons in the Lewis structure for CN ion. a. zero b. one c. four d. eight 20. Characterize the bond that forms between Be (1.5) and C (2.5) a. polar covalent bond c. coordinate covalent bond b. nonpolar covalent bond d. ionic bond

Explanation / Answer

17) answer: c

due to linear shape, polarity of bonds gets cancelation gives non-polar molecule.

18) E.N difference= 3.5-1 = 2.5

   if E.N difference > 1.9 , bond is ionic

answer: d

19) answer: c

both C,N having 1 lone pair each.

20) E.N difference= 2.5-1.5 = 1

   if E.N difference < 1.9 , bond is polar covalent

answer: a

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