Question

The type of attractive forces that operate between gaseous HCl molecules is

• A. Dipole-dipole forces
• B. Dispersion forces
• C. Ion-dipole forces
• D. Dipole-induced dipole forces
• E. Electrostatic forces

Hint:

Polar molecule + polar molecule = dipole-dipole force. HCl is polar, so it shows dipole-dipole attraction.

Answer 1

The Correct Option is A

Concept: HCl is a polar molecule because chlorine is more electronegative than hydrogen. Therefore, HCl molecules possess permanent dipoles.

Step 1: Check polarity of HCl.
In HCl: \[ H^{\delta+} - Cl^{\delta-} \] So, HCl has a permanent dipole moment.

Step 2: Identify intermolecular force.
Polar molecules attract each other through dipole-dipole interactions.

Step 3: Select the correct force.
Thus, gaseous HCl molecules show: \[ \text{Dipole-dipole forces} \]