Free Ionic and Molecular Crystals MCQs with Answers
62 Ionic and Molecular Crystals MCQs from Chemistry, each with the correct answer and a written explanation of why it is correct. Free and unlimited, with no account needed.
Ionic crystals contain oppositely charged ions held by electrostatic forces, whereas molecular crystals contain discrete molecules joined by weaker intermolecular forces. Their structures explain differences in melting point, hardness, volatility, solubility and electrical conductivity, especially between solid and molten states.
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- A. Hard
- B. Very hard
- C. Soft
- D. Always polar
Explanation: Option C is correct.Molecular crystals are soft. Molecular crystals are held together by weak intermolecular forces, such as van der Waals…
Correct answer: Soft- A. lonic
- B. Molecular
- C. Covalent
- D. Metallic
Explanation: Molecular crystals are formed by individual molecules held together by various types of intermolecular forces, including London dispersion…
Correct answer: Molecular- A. Face-centered cubic
- B. Metallic appearance
- C. 1-1 (g) > 1-1 (s) Bond length
- D. 1-1 (g) < 1-1 (s) Bond length
Explanation: In solid iodine, the molecules are closer together due to the packing in the crystal lattice, resulting in a longer bond length compared…
Correct answer: 1-1 (g) > 1-1 (s) Bond length- A. Naphthalene
- B. Dry ice
- C. Iodine
- D. Sugar
Explanation: Sugar is a polar molecule and hashydrogen bonding.
Correct answer: Sugar- A. Dipole-dipole forces
- B. London dispersion forces
- C. Hydrogen bonding
- D. Debye forces
Explanation: Solid iodine is non-polar and has London Dispersion forces amongst molecules.
Correct answer: London dispersion forces- A. Ionic crystal
- B. Molecular crystal
- C. Covalent crystal
- D. Metallic crystal
Explanation: Covalent crystals may have network structure,therefore, they have high melting points.
Correct answer: Covalent crystal- A. Solid phase
- B. Molten phase
- C. Liquid phase
- D. Vapour phase
Explanation: Independent molecule of NaCl may exist in only vapour phase.
Correct answer: Vapour phase- A. Covalent
- B. Ionic
- C. Metallic
- D. Molecular
Explanation: Dry ice is an example of molecular solid (Non-polar molecular solid).
Correct answer: Molecular- A. Face-centered cubic
- B. Metallic appearance
- C. 1-1 (g) > 1 - 1 (s) Bond lenght
- D. 1-1 (g) < 1 - 1 (s) Bond lenght
Explanation: 1-1 bond distance is 271.5 pm and it is appreciably longer than in gaseous iodine (266.6pm).Option C suggests that the bond length between…
Correct answer: 1-1 (g) > 1 - 1 (s) Bond lenght- A. Ionic
- B. Molecular
- C. Covalent
- D. Metallic
Explanation: Molecular crystals are formed by individual molecules held together by various types of intermolecular forces, including London dispersion…
Correct answer: Molecular- A. The only covalent compounds with high melting points are those in which hydrogen bonds occur.
- B. Any covalent compound that contains both oxygen and hydrogen in its molecule forms hydrogen bonds.
- C. lonic bonds and covalent bonds cannot both occur in the same compound.
- D. lonic compounds differ from metals in that ionic compounds do not conduct electricity in the solid state.
Explanation: The explanation for this question will be added soon.
Correct answer: lonic compounds differ from metals in that ionic compounds do not conduct electricity in the solid state.- A. Diamond
- B. NaCl
- C. Graphite
- D. None of the above
Explanation: Molecular crystals are substances that have relatively weak intermolecular binding, such as dry ice (solidified carbon dioxide), solid…
Correct answer: None of the above- A. Ice
- B. Iodine
- C. Sugar
- D. Salt
Explanation: Option A: Ice, glucose and urea are examples of hydrogen bonded molecular solids due to the hydrogen bonded in the molecular solids.
Correct answer: Iodine- A. H-bonding
- B. London dispersion forces
- C. Dipole-dipole forces
- D. Chemical bonding
Explanation: Option B "LONDON DISPERSION FORCES " is the correct option. London dispersion forces are forces of attraction between nonpolar molecules…
Correct answer: London dispersion forces- A. Sodium chloride
- B. Dry ice
- C. Copper
- D. CaCl2
Explanation: 'Discrete molecules' are units of a compound, the smallest possible i.e.
Correct answer: Dry ice- A. Conductor
- B. Non - conductor
- C. Semiconductor
- D. None of these
Explanation: A non-conductor, also known as an insulator, is a material that does not allow electric current to flow through it easily.
Correct answer: Non - conductor- A. Sugar
- B. Iron
- C. Diamond
- D. Na
Explanation: Ions bound together by electrostatic attraction form ionic crystals. Their arrangement varies depending on the ions' sizes or the radius…
Correct answer: Na- A. More than NaBr crystal
- B. Less than NaBr crystal
- C. Equal to NaBr crystal
- D. NaCl crystal doesn't conduct electric current
Explanation: In solid form, NaCl does not conduct electricity because its ions are locked in place within the crystal lattice and cannot move freely.
Correct answer: NaCl crystal doesn't conduct electric current- A. High melting point
- B. Deform when struck
- C. Fragility
- D. Crystalline
Explanation: Fragility refers to the tendency of a substance to break or shatter easily.
Correct answer: Fragility- A. ionic and covalent
- B. covalent and ionic
- C. covalent and coordinate covalent
- D. ionic and coordinate covalent
Explanation: The correct answer is 'ionic and covalent'. PbCl₂ is ionic because lead is in a +2 oxidation state, leading to electron transfer and ionic…
Correct answer: ionic and covalent