Question 1

Which of the following statements best describes the concept of hybridization in valence bond theory?

Accepted Answer

Hybridization is the process by which atomic orbitals mix to form new, equivalent orbitals that are used to form covalent bonds.

Question 2

A molecule has a central atom with three electron groups (EG) around it. What is the expected hybridization of the central atom?

Accepted Answer

$$sp^2$$

Question 3

Which of the following molecules contains a central atom with $$sp$$ hybridization?

Accepted Answer

CO$$_2$$

Question 4

Given the following electronegativities: H (2.1), Cl (3.0), what type of bond is formed between H and Cl?

Accepted Answer

Polar covalent

Question 5

Which of the following bonds is expected to be the most polar?

Accepted Answer

H–F

Question 6

A molecule has a linear electron geometry. Which hybridization does the central atom exhibit?

Accepted Answer

$$sp$$

Question 7

Which of the following best explains why the bond in H$$_2 is $$considered nonpolar?

Accepted Answer

The two hydrogen atoms have identical electronegativities, so electrons are shared equally.

Question 8

Which of the following is the correct order of increasing bond polarity for the following bonds: C–H, O–H, N–H?

Accepted Answer

C–H \u003c N–H \u003c O–H

Question 9

A central atom forms two double bonds and has no lone pairs. What is its hybridization and electron geometry?

Accepted Answer

$$sp$$ hybridization and linear geometry

Question 10

Which of the following statements about bond polarity is correct?

Accepted Answer

A bond is polar if the two atoms have different electronegativities and electrons are shared unequally.

Question 11

Which of the following molecules is expected to have a trigonal planar electron geometry?

Accepted Answer

BF$$_3$$

Question 12

If the electronegativity difference ($$\Delta EN) $$between two atoms is 2.5, what type of bond is most likely formed?

Accepted Answer

Ionic

Question 13

Which of the following best describes the electron geometry and hybridization of the central carbon in formaldehyde (CH$$_2O$$)?

Accepted Answer

Trigonal planar, $$sp^2$$

Question 14

Which of the following is a real-life application of bond polarity?

Accepted Answer

Water's polarity allows it to dissolve many ionic and polar substances, making it an excellent solvent in biological systems.

Question 15

A molecule contains a central atom with two electron groups and no lone pairs. Which of the following is true?

Accepted Answer

The molecule has a linear geometry and $$sp$$ hybridization.

Question 16

Which of the following best explains why CO$$_2 is a $$nonpolar molecule despite having polar bonds?

Accepted Answer

The molecule is linear, so the bond dipoles cancel each other out.

Question 17

Which of the following is the correct hybridization for the central atom in acetylene (C$$_2H$_2$$)?

Accepted Answer

$$sp$$

Question 18

A bond between two atoms has a $$\Delta EN of 0.3. $$According to the table, what type of bond is this?

Accepted Answer

Non-polar covalent

Question 19

Which of the following best describes the relationship between bond polarity and molecular polarity?

Accepted Answer

A molecule can have polar bonds but still be nonpolar overall if the bond dipoles cancel due to molecular geometry.

Hybridization and Bond Polarity: Lecture 18

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