1st Year Chemistry MCQS with Answers Chapter 4

One of the following liquids has lowest vapour pressure at 32°C. Indicate that liquid

Ether

Chloroform

Water

Ethanol

NH₃shows a maximum boiling point among the hydrides of V-A group elements due to

Very small size of nitrogen

Enhanced electronegative character of Nitrogen

Pyramidla structure of NH₃

Lone pair electrons present on Nitrogen

NaCI is face centered cubic structure. The Na ion at the face of the unit cell is shared by

8-unit cells

2-unit cells

4-unit cells

Only one unit cell

Which of the following can form H-bonds

C₂H₆

NH₃

NaCI

CHCI₃

The molecules of CO₂in dry ice form the

Ionic crystal

Molecular crystals

Any type of crystals

Covalent crystals

The polarizabilities of elements mostly increase down the group due to the reason that

Number of shells increase along, with increase of shielding effect

The behavior of the elements remain the same

The atomic numbers increase

Number of protons increase

The repulsion of electronic clouds of the molecules are responsible for the attractive forces among the molecules. These forces are

Dipole-induced dipole forces

Ion-dipole forces

Dipole-dipole forces

Instantaneous dipole-induced dipole forces