Question

2 Points

Answer 1

Answer:

A. Attractive forces called hydrogen bonds

Explanation:

Answer 2

Answer:

A. Attractive forces called hydrogen bonds

Explanation:

Liquid water contains water molecules. The attractive forces between the water molecules is called HYDROGEN BONDING.

Hydrogen bonding is the intermolecular forces which exists between h atom and the highly electronegative atoms like N, O, F.

For example  

$H_2 O, HF, NH_3$

It is a polar covalent bond.  

It has a strong intermolecular forces.

Its strength is more than that of the London dispersion forces

It is also called as a dipole –dipole forces.

Dipole –dipole forces is the forces which exist between the polar molecules.

The electronegative values of H is 2.1

F is 4.0

O is 3.5 and

N is 3.0

∆E value of HF Hydrogen  bond  is 4.0 - 2.1 = 1.9

∆E value of $H_2O$ Hydrogen bond is 3.5 - 2.1 = 1.4

∆E value of $NH_3$ Hydrogen bond is 3.0 - 2.1 = 0.9

∆E value between 0.5 to 1.7 is a polar covalent bond

Hence Hydrogen bond is a bond between polar molecules and also comes under the category of dipole-dipole forces.