Question 1

Which of the following molecules is expected to have a polar bond but be nonpolar overall due to its molecular geometry?

Accepted Answer

CO$$_2$$

Question 2

Which element has the highest electronegativity according to the periodic trend?

Accepted Answer

Fluorine

Question 3

What is the formal charge on the central atom in the Lewis structure of SO$$_2$$ where both oxygens are double-bonded to sulfur?

Accepted Answer

0

Question 4

Which molecule is an exception to the octet rule because it has fewer than 8 electrons around its central atom?

Accepted Answer

BF$$_3$$

Question 5

Which of the following bonds is the shortest and strongest?

Accepted Answer

Triple bond between two nitrogen atoms ($$\mathrm{N \equiv N})$$

Question 6

What is the molecular geometry and bond angle of ammonia (NH$$_3) $$according to VSEPR theory?

Accepted Answer

Trigonal pyramidal, $$\approx 107^\circ$$

Question 7

Which of the following molecules has resonance structures?

Accepted Answer

O$$_3$$

Question 8

What is the hybridization of the central atom in methane (CH$$_4$$)?

Accepted Answer

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

Question 9

How many sigma ($$\sigma) $$and pi ($$\pi) $$bonds are present in ethene (C$$_2H$_4$$)?

Accepted Answer

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

Question 10

Which molecule is predicted to be paramagnetic based on molecular orbital theory?

Accepted Answer

O$$_2$$

Question 11

Calculate the bond order for the O$$_2$$ molecule using molecular orbital theory.

Accepted Answer

2

Question 12

Which of the following best explains why the bond angle in water (H$$_2O) is $$less than the ideal tetrahedral angle?

Accepted Answer

Lone pairs on oxygen repel more strongly than bonding pairs

Question 13

Which of the following ions has a bond order of 2.5 according to molecular orbital theory?

Accepted Answer

O$$_2^+$$

Question 14

A molecule has a central atom with three bonding pairs and one lone pair. What is its molecular shape?

Accepted Answer

Trigonal pyramidal

Question 15

Which of the following molecules contains both sigma and pi bonds?

Accepted Answer

C$$_2H$_2 ($$acetylene)

Question 16

Which of the following statements about resonance is correct?

Accepted Answer

Resonance structures represent delocalized electrons within a molecule

Question 17

Which molecule is predicted to have a bond angle closest to $$120^\circ$$?

Accepted Answer

BF$$_3$$

Question 18

Which of the following molecules is predicted to be nonpolar despite having polar bonds?

Accepted Answer

CCl$$_4$$

Question 19

Which hybridization is associated with a linear molecular geometry?

Accepted Answer

$$\mathrm{sp}$$

Question 20

A patient is exposed to carbon monoxide (CO). Which property of CO makes it dangerous, based on its molecular structure?

Accepted Answer

CO has a triple bond and a lone pair on carbon, allowing it to bind strongly to hemoglobin

Chemical Bonding: Lewis Structures, Molecular Shapes, and Bond Theories

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