Based on electronegativities, which one of the following would have ionic bonds?

Question

Based on electronegativities, which one of the following would have ionic bonds? a. O_2 b. MgCl_2 c. H_2O d. CF_4 e. SiO_2 The correct H-N-H bond angle in NH_3, is a. the same as the H - O - H angle in water. b. exactly 109.5 degree. c. greater than 109.5 degree. d. less than 109.5 degree. e. 120 degree. Which of the following molecules or ions a not polar? a. O_3 b. H_2O c. SO_2 d. I_3^- e. S_3 Which of the following molecules has a carbon atom that is sp^3 hybridized? a. C_2H_2 b H_2CO c. CH_3Cl d. C_2H_4 e. C_2H_2Cl_2 What are the hybridizations of the carbon atoms in CH_3CH_2COH, in order from left to right? a. sp^3, sp^3, sp^2 b. sp^3, sp^3, sp^3 c. sp^3, sp^2, sp^3 d. sp^2, sp^2, sp^3 e. sp^3, sp^2, sp^2 Which type of molecular orbital is used to describe a buildup of electron density along the axis connecting two atomic nuclei to form a bond? a. sigma b. pi c. sigma* d. pi* e. p_y Which of the following compounds is capable of dipole-dipole interactions? a. CH_4 b. CO_2 c. H_2CO d. SF_6 e. NH_4 Dispersion forces are due to a. permanent dipoles. b. temporary dipoles. c. hydrogen bonding. d. ionic interactions. e. protons. Which of the following molecules will have the highest boiling point? a. CO_2 b. C_6H_6 (benzene) c. C_6F_6 (hexafluorobenzene) d. C_2H_2 e. CF_4

Explanation / Answer

6. b.MgCl2 ( between Mg and cl electronegativity the difference is very high.so that MgCl2 is ionic )

7. d. less than 109.5 ( because of presence of lone pair on N-atom)

8. answer: a,e

9. answer: c ( carbon is linked to four sigma bonds)

10. answer: a

11. answer: a

12. answer: c

13. answer: b

14. answer: c ( highest molarmass results high boilingpoint)

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