20-minute Test : Part VI Microscopic World II

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

• Methane
• Ammonia
• Phosphorus pentafluoride
• Carbon dioxide

Which of the following bonds is the most polar?

• C–N
• C–O
• C–F
• O–F

In which of the following pairs do the molecules have a similar shape?

• CO2 and SO2
• CCl4 and SiF4
• BF3 and NH3
• O2 and O3

Which of the following gives the correct order of boiling points of NH3, HCl, HF and H2O?

• NH3 < HCl < HF < H2O
• NH3 < H2O < HCl < HF
• HCl < NH3 < H2O < HF
• HCl < NH3 < HF < H2O

The electronic arrangements of elements X (2,4) and Y (2,8,18,7) are shown in the table below.

• Linear

• Trigonal planar

• Tetrahedral

• Octahedral

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

• The open structure of ice collapses.
• The hydrogen bonds among water molecules are weakened.
• The number of covalent bonds in ice remains unchanged.
• The density of ice decreases.

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

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

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

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

• 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?

• Linear
• V-shaped
• Trigonal planar
• Tetrahedral

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

• CH2=CH2
• ClF3
• H2O2
• PCl3

The three-dimensional structure of an SF4 molecule is shown below. Which of the following combinations about the SF4 molecule is correct?

• octet and polar

• octet and non-polar

• non-octet and polar

• non-octet and non-polar