Chemical bonding & structure (First test)

For each question choose the answer you consider to be the best.

1. What are the correct formulas for magnesium sulfate and aluminium phosphide?

A. Mg(SO₄)₂ and AlPO₄

B. MgSO₄ and AlPO₄

C. MgSO₄ and AlP

D. Mg(SO₄)₂ and AlP

2. Metal M shows only one oxidation state when it forms compounds. The formula of the oxide of M is M₂O₃?
Which is the correct formula for another of the compounds M forms?
A. M₃P₂

B. MP

C. M₂P

D. M₂P₃

3. Which describes ionic bonding best?

A. The electrostatic attraction between nuclei and pairs of electrons

B. The electrostatic attraction between positive ions and negative ions

C. The electrostatic attraction between a positive ion and an electron

D. The electrostatic attraction between protons and electrons

4. Which statements accurately describe the structure of solid sodium chloride?

I. It is an ionic lattice

II. Each sodium ion is surrounded by six chloride ions

III. The sodium ions are arranged octahedrally around each chloride ion

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

5. Which molecule or ion contains a coordinate (dative) bond?

A. CO₂

B. C₂H₄

C. OH^-

D. NH₄⁺

6. Which statement best describes the intramolecular bonding in ammonia?

A. Van der Waals’ forces and hydrogen bonding

B. Electrostatic attraction between nuclei and shared pairs of electrons

C. London dispersion forces only

D. Hydrogen bonding only

7. Which statements are correct about carbon to oxygen bond lengths?

I. The C to O bond lengths are equal in CH₃COOH.

II. The C to O bond length in carbon monoxide is shorter than the C to O
bond length in carbon dioxide.

III. The C to O bond lengths in the ethanoate ion, CH₃COO^- , are equal.

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

8. What is VSEPR (Valence Shell Electron Pair Repulsion theory) used for?

A. To predict the Lewis structure of a molecule

B. To show the arrangement of energy levels in a particular atom

C. To deduce the shape of a molecule or simple ion

D. To deduce the type of bonding in a compound

9. What is the O-N-O bond angle in the NO₃^- ion?

A. 109.5^o

B. 120^o

C. between 100^o and 109^o

D. 90^o

10. How many bonding pairs and non-bonding pairs of electrons are around the sulfur atom in a molecule of SCl₄?

11. According to VSEPR theory which molecules or ion are predicted to contain a bond angle less than 109^o?      

I. NH₃

II. CCl₄

III. H₃O⁺

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

12. Which shows the increasing order of oxygen to oxygen bond lengths in oxygen, ozone
and hydrogen peroxide?

A. O₂ < O₃ < H₂O₂

B. O₃ < O₂ < H₂O₂

C. H₂O₂ < O₂ < O₃

D. O₃ < H₂O₂ < O₂

13. What is the shape of the ICl₄^- ion?

A. Tetrahedral

B. Square pyramidal

C. Octahedral

D. Square planar

14. Which combination shows the number of non-bonded electron pairs in the Lewis structure, the shape of the molecule and the type of hybridization present in a molecule of dichloromethane, CH₂Cl₂?

15. Which is a correct statement about the NO₂^- ion?

A. The N atom is sp² hybridized

B. The ion has a linear shape

C. There are two non-bonded pairs of electrons on the N atom

D. There are double bonds between the N atom and the two O atoms

16. What is the geometry of the bonds around an atom that is sp hybridised?

A. 4 bonds at 90^o

B. 4 bonds at 109.5^o

C. 3 bonds at 120^o

D. 2 bonds at 180^o

17. Which types of hybridization are shown by the carbon atoms in propene?

I. sp³

II. sp²

III. sp

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

18. Which contain delocalized electrons?

I. CO

II. O₃

III. CH₃COO^-

A. I and II only

B. I and III only

C. II and III only

D. I, II and III

19. Which types of hybridization are present in but-1-yne, CH₃CH₂CCH?

A. sp, sp² and sp³

B. sp and sp³ only

C. sp² and sp³ only

D. sp and sp² only

20. Which will not conduct electricity?

A. Hg(l)

B. NaCl(s)

C. PbBr₂(l)

D. HCl(aq)

Answers

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