Part VI Microscopic World II

In which of the following molecules are all of its atoms arranged on the same plane?

• A. Methane

• B. Ammonia

• C. Phosphorus pentafluoride

• D. Carbon dioxide

Which of the following bonds is the most polar?

• A. C–N

• B. C–O

• C. C–F

• D. O–F

In which of the following pairs do the 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 gives the correct order of boiling points of NH₃, HCl, HF and H₂O?

• A. NH₃ < HCl < HF < H₂O

• B. NH₃ < H₂O < HCl < HF

• C. HCl < NH₃ < H₂O < HF

• D. HCl < NH₃ < HF < H₂O

The electronic arrangements of elements X and Y are shown in the table above.

X reacts with Y to form compound Z. What is the shape of Z?

• A. Linear

• B. Trigonal planar

• C. Tetrahedral

• D. Octahedral

Which of the following does NOT happen when ice is melting?

• A. The open structure of ice collapses.

• B. The hydrogen bonds among water molecules are weakened.

• C. The number of covalent bonds in ice remains unchanged.

• D. The density of ice decreases.

Which of the following statements concerning compounds J and K is correct?

• A. J has a higher boiling point because it has a greater area of contact with one another.

• B. K has a higher boiling point because it has a greater area of contact with one another.

• C. J has a higher boiling point because it has a higher molecular polarity.

• D. K has a higher boiling point because it has a higher molecular polarity.

A CNCl molecule has an octet structure. What is the shape of it?

• A. Linear

• B. V-shaped

• C. Trigonal planar

• D. Tetrahedral

Which of the following molecules has a non-octet structure?

• A. CH₂=CH₂

• B. ClF₃

• C. H₂O₂

• D. PCl₃

The three-dimensional structure of an SF₄ molecule is shown above.

Which of the following combinations about the SF₄ molecule is correct?

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