25-minute Test : Part VI Microscopic World II

Arrange the following compounds in order of increasing boiling point:

• A. (1), (2), (3)
• B. (1), (3), (2)
• C. (2), (3), (1)
• D. (3), (2), (1)

Which of the combinations is INCORRECT?

• A

• B

• C

• D

Which of the following pairs of molecules have a similar shape?

• A. CO₂ and SO₂
• B. CCl₄ and SiF₄
• C. BF₃ and NH₃
• D. O₂ and O₃

Which of the following is NOT a molecular crystal?

• A. Iodine
• B. Sulphur
• C. Table sugar
• D. Table salt

The structure of glucose (C₆H₁₂O₆) is shown below. Which of the following statements best explains the high solubility of glucose in water?

• A. Both glucose and water are made up of polar molecules.

• B. Glucose molecules can form extensive hydrogen bonding with water molecules.

• C. Glucose molecules contain double bonds.

• D. Glucose reacts with water and forms a colourless solution.

Which of the following correctly arranges the substances in ascending order of boiling point?

• A. CO₂ < H₂O₂ < SiO₂ < SO₂
• B. H₂O₂ < CO₂ < SO₂ < SiO₂
• C. H₂O₂ < CO₂ < SiO₂ < SO₂
• D. CO₂ < SO₂ < H₂O₂ < SiO₂

In which of the following compounds do(es) the chlorine atom(s) carry a partial positive charge?

(Electronegativity values: C = 2.55, O = 3.44, P = 2.19, Cl = 3.16, Br = 2.96)

• A. CCl₄

• B. PCl₃

• C. OCl₂

• D. BrCl

Which of the following molecules is non-polar with polar bond(s)?

• A. H₂S
• B. CHCl₃
• C. CS₂
• D. Br₂

H₂O has a higher boiling point than NH₃ because

• A. H₂O is more polar.
• B. H₂O has a larger molecular size.
• C. H₂O can form more extensive hydrogen bonding between its molecules.
• D. H₂O can form stronger hydrogen bonds between its molecules.

Which of the following statements about H₂O and CH₃CH₂OH is INCORRECT?

• A. They are miscible with each other.
• B. Both of them are polar substances.
• C. Both of them can form hydrogen bonds with ethanoic acid.
• D. Both of them have open structures in the solid state.