Question 1

Predict the geometry around the central atom in PO₄^3-. A)trigonal planar B)trigonal pyramidal C)tetrahedral D)trigonal bipyramidal E)octahedral

Accepted Answer

There are a total of 6 atoms or groups of electrons attached to the central atom (1 P and 5 S). This means the central atom is sp3 hybridized and the geometry is tetrahedral.

Question 2

The bond angles in CO₃^2- are expected to be A)a little less than 109.5°. B)109.5°. C)a little less than 120°. D)120°. E)a little more than 120°.

Accepted Answer

The CO₃²⁻ ion has a trigonal planar geometry due to the sp² hybridization of the central carbon atom, resulting in bond angles of 120°.

Question 3

The bond angles in SCl₂ are expected to be A)a little less than 109.5°. B)109.5°. C)a little more than 109.5°. D)120°. E)180°.

Accepted Answer

The molecule SCl₂ has a trigonal bipyramidal molecular geometry (based on the VSEPR theory). The axial bonds are arranged at a 180° angle from each other, while the equatorial bonds are arranged at a 120° angle from each other. The bond angle between an axial bond and an equatorial bond is expected to be less than 120° but more than the ideal tetrahedral angle of 109.5° due to the electron-electron repulsion caused by the lone pairs on the equatorial atoms. Therefore, the bond angles in SCl₂ are expected to be a little less than 109.5°, making choice A the best answer.

Question 4

According to VSEPR theory, which one of the following species has a tetrahedral geometry? A)IF₄⁺ B)IF₄^- C)PCl₄⁺ D)PCl₄^- E)SeF₄

Accepted Answer

According to VSEPR theory, a tetrahedral geometry is formed when a central atom is bonded to four other atoms, with all four bonds directed towards the corners of a tetrahedron. In option C, P is the central atom and it is bonded to four atoms (three Cl atoms and one lone pair of electrons) with a tetrahedral geometry. The other options do not have a tetrahedral geometry.

Question 5

A molecule with 3 single bonds and 1 lone pair of electrons around the central atom is predicted to have what type of molecular geometry?
A)Tetrahedral
B)Trigonal pyramidal
C)Bent
D)Trigonal bipyramidal
E)Linear

Accepted Answer

A molecule with 3 single bonds and 1 lone pair of electrons around the central atom has a trigonal pyramidal molecular geometry. The lone pair of electrons takes up more space than the bonding pairs, causing the angle between the bonding pairs to be less than 109.5 degrees.

Question 6

The bond angles in ICl₂^- are expected to be A)a little less than 109.5°. B)109.5°. C)a little more than 109.5°. D)120°. E)180°.

Accepted Answer

ICl2- has a linear shape due to the presence of three lone pairs and two bonding pairs around the central iodine atom, resulting in a bond angle of 180°.

Question 7

Which of the following substances is/are bent? (i)H₂S (ii).CO₂ (iii)ClNO (iv)NH₂^- (v)O₃ A)only (iii) B)(i)and (v) C)(i), (iii), and (v) D)(i), (ii), (iii), and (v) E)(i), (iii), (iv), and (v)

Accepted Answer

The answer of Which of the following substances is/are bent?...

Question 8

A molecule with 5 single bonds (and any number of lone pairs)could have which type of molecular geometry? I.Trigonal bipyramidal
II.Seesaw
III.T-shaped
IV.Square pyramidal
A)I and II
B)I, III, and IV
C)II and III
D)I and IV
E)I, II, III, and IV

Accepted Answer

The answer of A molecule with 5 single bonds (and...

Question 9

A molecule with 4 single bonds and 1 lone pair of electrons is predicted to have which type of molecular geometry?
A)Octahedral
B)T-shaped
C)Seesaw
D)Trigonal bipyramidal
E)Linear

Accepted Answer

A molecule with 4 single bonds and 1 lone pair of electrons has a steric number of 5. This corresponds to a molecular geometry of either trigonal bipyramidal or seesaw. However, since there is 1 lone pair of electrons, the molecule will have a distorted shape, resulting in a seesaw geometry.

Question 10

A molecule with 4 single bonds (and any number of lone pairs)could have which of the following molecular geometries? I.Tetrahedral
II.Seesaw
III.Square Planar
IV.T-shaped
A)I only
B)I and III
C)II and III
D)I, II, and III
E)I, II, III, and IV

Accepted Answer

A molecule with 4 single bonds has 4 electron pairs around the central atom. The possible molecular geometries are determined by the number of lone pairs and the number of bonded atoms. 
I. Tetrahedral - this geometry has 4 bonded atoms and no lone pairs 
II. Seesaw - this geometry has 3 bonded atoms and 1 lone pair 
III. Square Planar - this geometry has 2 bonded atoms and 2 lone pairs 
IV. T-shaped - this geometry has 2 bonded atoms and 3 lone pairs 
Thus, a molecule with 4 single bonds could have molecular geometry I, II, or III. Therefore, the best choice is D, as it includes all three possibilities.

Question 11

A central atom with 5 electron pairs (single bonds and/or lone pairs of electrons)could have which of the following molecular geometries? I.Trigonal bipyramidal
II.Seesaw
III.T-shaped
IV.Linear
A)I, II, and III
B)II, III, and IV
C)I, III, and IV
D)I, II, and IV
E)I, II, III, and IV

Accepted Answer

The answer of A central atom with 5 electron pairs...

Question 12

Predict the geometry around the central atom in SO₄^2-. A)trigonal planar B)trigonal pyramidal C)tetrahedral D)trigonal bipyramidal E)octahedral

Accepted Answer

First, we need to determine the central atom. In this case, the central atom is P, as it is bonded to multiple atoms.

Next, we need to count the total number of electron groups around the central atom. This includes both bond pairs and lone pairs of electrons.

There are three S atoms bonded to the P atom, as well as one lone pair of electrons. Therefore, there are a total of 4 electron groups around the central P atom.

When there are 4 electron groups, the geometry is tetrahedral. Therefore, the best choice is C.

Question 13

The bond angles in SF₅⁺ are expected to be A)90°. B)120°. C)90° and 120°. D)90° and 180°. E)90°, 120°, and 180°.

Accepted Answer

SF5+ has a trigonal bipyramidal geometry, which includes bond angles of 90°, 120°, and 180°.

Question 14

A central atom with 4 electron pairs (single bonds and/or lone pairs of electrons)could have which of the following molecular geometries? I.Trigonal bipyramidal
II.Tetrahedral
III.Trigonal pyramidal
IV.Bent
A)I and II
B)II and III
C)II, III, and IV
D)I and IV
E)I, II, and IV

Accepted Answer

The answer of A central atom with 4 electron pairs...

Question 15

The bond angle in Cl₂O is expected to be approximately A)90° B)109.5° C)120° D)145° E)180°

Accepted Answer

The bond angle in Cl2O is approximately 109.5° because the molecule has a bent shape similar to water (H2O), due to the two lone pairs on the oxygen atom, which results in a tetrahedral electron geometry.

Question 16

A molecule with 3 single bonds and 0 lone pairs of electrons is predicted to have which type of molecular geometry?
A)Trigonal planar
B)Trigonal pyramidal
C)Bent
D)Trigonal bipyramidal
E)Linear

Accepted Answer

A molecule with 3 single bonds and 0 lone pairs of electrons adopts a trigonal planar geometry according to VSEPR theory.

Question 17

Which of the following substance is/are planar? (i)SO₃ (ii)SO₃^2- (iii)NO₃^- (iv)PF₃ (v)BF₃ A)(i)and (ii) B)(i), (iii), and (v) C)(iv) D)(i), (ii), (iii), and (v) E)(i), (iii), (iv), and (v)

Accepted Answer

Planar molecules are those that have all atoms in the same plane. In the given substances, (i) and (ii) have a planar structure because all atoms lie in the same plane. In (iii) and (v), there are atoms that do not lie in the same plane, hence they are not planar. In (iv), there is no information about the arrangement of atoms, so we cannot conclude its planarity. Therefore, the correct answer is (i), (iii), and (v).

Question 18

A molecule with 2 single bonds and 2 lone pairs of electrons around the central atom is predicted to have what type of molecular geometry?
A)Tetrahedral
B)Trigonal pyramidal
C)Bent
D)Trigonal bipyramidal
E)Linear

Accepted Answer

A molecule with 2 single bonds and 2 lone pairs of electrons around the central atom has a tetrahedral electron pair geometry. However, since there are two lone pairs present, the lone pairs repel each other more strongly than they do the bonding pairs, leading to a bent molecular geometry. This is commonly referred to as the "lone pair effect." The central atom in this molecule is also sp3 hybridized.

Question 19

A molecule with 2 single bonds and 3 lone pair of electrons is predicted to have which type of moleculary geometry?
A)Octahedral
B)T-shaped
C)Seesaw
D)Trigonal bipyramidal
E)Linear

Accepted Answer

The answer of A molecule with 2 single bonds and...

Question 20

A molecule with 3 single bonds (and any number of lone pairs)could have which of the following molecular geometries? I.Trigonal planar
II.Trigonal pyramidal
III.Seesaw
IV.T-shaped
A)I and II
B)II and III
C)II and IV
D)I and III
E)I, II, and IV

Accepted Answer

The answer of A molecule with 3 single bonds (and...

Quiz 10: Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Predict the geometry around the central atom in PO₄^3-.

The bond angles in CO₃^2- are expected to be

The bond angles in SCl₂ are expected to be

According to VSEPR theory, which one of the following species has a tetrahedral geometry?

A molecule with 3 single bonds and 1 lone pair of electrons around the central atom is predicted to have what type of molecular geometry?

The bond angles in ICl₂^- are expected to be

Which of the following substances is/are bent? (i) H₂S (ii) .CO₂ (iii) ClNO (iv) NH₂^- (v) O₃

A molecule with 5 single bonds (and any number of lone pairs) could have which type of molecular geometry? I.Trigonal bipyramidal II.Seesaw III.T-shaped IV.Square pyramidal

A molecule with 4 single bonds and 1 lone pair of electrons is predicted to have which type of molecular geometry?

A molecule with 4 single bonds (and any number of lone pairs) could have which of the following molecular geometries? I.Tetrahedral II.Seesaw III.Square Planar IV.T-shaped

A central atom with 5 electron pairs (single bonds and/or lone pairs of electrons) could have which of the following molecular geometries? I.Trigonal bipyramidal II.Seesaw III.T-shaped IV.Linear

Predict the geometry around the central atom in SO₄^2-.

The bond angles in SF₅⁺ are expected to be

A central atom with 4 electron pairs (single bonds and/or lone pairs of electrons) could have which of the following molecular geometries? I.Trigonal bipyramidal II.Tetrahedral III.Trigonal pyramidal IV.Bent

The bond angle in Cl₂O is expected to be approximately

A molecule with 3 single bonds and 0 lone pairs of electrons is predicted to have which type of molecular geometry?

Which of the following substance is/are planar? (i) SO₃ (ii) SO₃^2- (iii) NO₃^- (iv) PF₃ (v) BF₃

A molecule with 2 single bonds and 2 lone pairs of electrons around the central atom is predicted to have what type of molecular geometry?

A molecule with 2 single bonds and 3 lone pair of electrons is predicted to have which type of moleculary geometry?

A molecule with 3 single bonds (and any number of lone pairs) could have which of the following molecular geometries? I.Trigonal planar II.Trigonal pyramidal III.Seesaw IV.T-shaped