Q: Which of the following statements about molecular orbital (MO) theory is correct?

Bond order can be calculated as $$\frac{1}{2}(\text{number of bonding electrons} - \text{number of antibonding electrons}).$$

Question 1

Which of the following statements best describes the difference between ionic and covalent bonding?

Accepted Answer

Ionic bonding involves the transfer of electrons from one atom to another, resulting in charged ions, while covalent bonding involves the sharing of electrons between atoms.

Question 2

Which of the following molecules is expected to be nonpolar based on its geometry and bond dipoles?

Accepted Answer

CO2 (carbon dioxide)

Question 3

What is the correct formula for the compound formed between calcium and nitrate ions?

Accepted Answer

$$\mathrm{Ca(NO_3$)_2}$$

Question 4

Which of the following elements is most likely to form an expanded octet in its compounds?

Accepted Answer

Phosphorus

Question 5

Given the Lewis structure for ozone ($$\mathrm{O_3$}$$), which statement about its resonance is correct?

Accepted Answer

Ozone has two resonance structures, each with a different location for the double bond.

Question 6

Which of the following ions has a charge of $$-2$$ and contains sulfur?

Accepted Answer

Sulfate ($$\mathrm{SO_4$^{2-}})$$

Question 7

What is the formal charge on the central atom in the Lewis structure of $$\mathrm{NH_4$^+} ($$ammonium ion)?

Accepted Answer

$$0$$

Question 8

Which of the following molecules has a trigonal planar electron-domain geometry?

Accepted Answer

BF3 (boron trifluoride)

Question 9

Which of the following best describes the bond order in the resonance hybrid of the carbonate ion ($$\mathrm{CO_3$^{2-}}$$)?

Accepted Answer

Each C–O bond has a bond order of $$\frac{1}{3}.$$

Question 10

Which of the following statements about molecular orbital (MO) theory is correct?

Accepted Answer

Bond order can be calculated as $$\frac{1}{2}(	ext{number of bonding electrons} - 	ext{number of antibonding electrons}).$$

Question 11

Which of the following molecules is paramagnetic according to molecular orbital theory?

Accepted Answer

O2 (oxygen)

Question 12

What is the hybridization of the central atom in $$\mathrm{CH_4$} ($$methane)?

Accepted Answer

$$\mathrm{sp^3$}$$

Question 13

How many $$\sigma$$ and $$\pi$$ bonds are present in ethene ($$\mathrm{C_2H_4}$$)?

Accepted Answer

5 $$\sigma$$ bonds and 1 $$\pi$$ bond

Question 14

Which of the following compounds is named correctly according to IUPAC nomenclature?

Accepted Answer

Sodium carbonate ($$\mathrm{Na_2CO_3})$$

Question 15

Which of the following best describes the geometry and polarity of water ($$\mathrm{H_2O}$$)?

Accepted Answer

Bent geometry; polar molecule

Question 16

Which of the following is the correct name for $$\mathrm{$$HNO_3$$}$$?

Accepted Answer

Nitric acid

Question 17

A molecule has a central atom with two bonding pairs and two lone pairs. What is its molecular geometry and ideal bond angle?

Accepted Answer

Bent; $$104.5^\circ$$

Question 18

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

Accepted Answer

Fluoride ($$\mathrm{F^-})$$

Question 19

Which of the following statements about bond polarity is correct?

Accepted Answer

A bond between carbon and hydrogen is considered nonpolar covalent.

Question 20

Which of the following molecules or ions violates the octet rule by having fewer than eight electrons around the central atom?

Accepted Answer

BF3 (boron trifluoride)

Chemical Bonding, Molecular Geometry, and Advanced Bonding Theories

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