Quiz 1 - Molecular Geometry | Molecular Geometry

General Chemistry 1 - Quiz 1 - Molecular Geometry

1

Which of the following species is square planar?

XeF: AX4E;     BF4: AX;     SF: AX4E ;     SiF: AX4

square planar: AX4E2

2

Which of the following species is T-shaped?

ClF: AX3E;     PF: AX3E ;     ClO3:     AX3E ;     NH: AX3E

T-shaped: AX3E2

3

What is the electron pair geometry of H2O?

H2O: 4 electron groups around the central oxygen atom (2 neighboring atoms + 2 lone pairs)

4

What is the molecular shape of ICl2-?

ICl2-: 5 electron groups around the central iodine atom (2 neighboring atoms + 3 lone pairs) ⇒ AX2E3

5

Which of the following molecules is nonpolar?

SF6 is octahedral (AX6) ⇒ bond dipoles in SF6 cancel each other ⇒ overall dipole moment of SF6 = 0

6

Which of the following molecules has a dipole moment?

SO2 is bent (AX2E) ⇒ bond dipoles do not cancel each other ⇒ overall dipole moment of SO2  0

7

What is the molecular geometry of the ion ClO4-?

ClO4- has four bonding pairs and no lone pairs around the central chlorine atom, resulting in a tetrahedral molecular geometry.

8

Which molecule has the smallest bond angle due to lone pair repulsion?

H2O has two lone pairs on the oxygen atom, which exert strong repulsive forces, reducing the H-O-H bond angle to about 104.5°, compared to NH3 (107°) and CH4 (109.5°).

9

Which of the following molecules has bond angles closest to 90°?

SF6 has six bonding pairs and no lone pairs around the central sulfur atom, resulting in an octahedral shape with bond angles of 90°.

10

What is the correct VSEPR notation for XeO4?

XeO4 has four bonding pairs and no lone pairs around the central xenon atom, resulting in the VSEPR notation AX4 and a tetrahedral shape.