Question 1

Which of the following best explains why the lattice energy of MgO is much higher than that of NaCl?

Accepted Answer

MgO has ions with higher charges and smaller ionic radii, increasing the electrostatic attraction.

Question 2

Which of the following compounds contains both ionic and covalent bonds?

Accepted Answer

NH4NO3

Question 3

What is the correct formula for iron(III) oxide?

Accepted Answer

$$\mathrm{Fe_2O_3}$$

Question 4

Which of the following molecules is nonpolar, despite having polar bonds?

Accepted Answer

$$\mathrm{CO_2$}$$

Question 5

Which of the following best describes the geometry and bond angle of methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Tetrahedral, $$109.5^\circ$$

Question 6

Which of the following statements about resonance structures is correct?

Accepted Answer

Resonance structures differ only in the arrangement of electrons, not atoms.

Question 7

Which of the following molecules has a square planar molecular geometry?

Accepted Answer

$$\mathrm{$$ICl_4$$^-}$$

Question 8

Which of the following best explains why water ($$\mathrm{H_2O}) $$has a higher boiling point than methane ($$\mathrm{CH_4$}$$)?

Accepted Answer

Water forms hydrogen bonds, which are stronger than the London dispersion forces in methane.

Question 9

Which of the following is the correct name for $$\mathrm{N_2O_5}$$?

Accepted Answer

Dinitrogen pentoxide

Question 10

Which of the following ions is isoelectronic with neon ($$\mathrm{Ne}$$)?

Accepted Answer

$$\mathrm{Na^+}$$

Question 11

Which of the following best describes the bond in hydrogen fluoride ($$\mathrm{HF}$$)?

Accepted Answer

Polar covalent

Question 12

Which of the following compounds is expected to have the highest melting point?

Accepted Answer

$$\mathrm{MgO}$$

Question 13

What is the correct systematic name for $$\mathrm{$$FeCl_2$$}$$?

Accepted Answer

Iron(II) chloride

Question 14

Which of the following molecules is expected to be polar?

Accepted Answer

$$\mathrm{H_2O}$$

Question 15

Which of the following best describes the electron-domain geometry and molecular geometry of ammonia ($$\mathrm{NH_3$}$$)?

Accepted Answer

Tetrahedral, trigonal pyramidal

Question 16

Which of the following is the correct formula for calcium phosphate?

Accepted Answer

$$\mathrm{Ca_3$(PO_4$)_2}$$

Question 17

Which of the following is a correct statement about the octet rule?

Accepted Answer

Elements in the third period and beyond can have more than eight valence electrons.

Question 18

Which of the following intermolecular forces is the strongest?

Accepted Answer

Ion-ion interactions

Question 19

Which of the following best explains why $$\mathrm{BF_3$} is $$nonpolar even though the B–F bonds are polar?

Accepted Answer

The molecule is trigonal planar, and the bond dipoles cancel due to symmetry.

Question 20

Which of the following is the correct name for $$\mathrm{H_2SO_4}$$?

Accepted Answer

Sulfuric acid

Chemical Bonding and Molecular Geometry: Structured Study Notes

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