p-Block elementsMedium

Question

Given below are two statements:

Statement I: The boiling point of hydrides of Group 16 elements follow the order

$H_{2}O > H_{2}Te > H_{2}Se > H_{2}\text{ }S$.

Statement II: On the basis of molecular mass, $H_{2}O$ is expected to have lower boiling point than the other members of the group but due to the presence of extensive H -bonding in $H_{2}O$, it has higher boiling point.

In the light of the above statements, choose the correct answer from the options given below:

Options

A.Statement I is true but Statement II is false
B.Statement I is false but Statement II is true
C.Both Statement I and Statement II are true
D.Both Statement I and Statement II are false

Solution

Sol. [Key Concept: Boiling points of Group 16 hydrides]

Both statements are true. H₂O has an unusually high boiling point because of extensive intermolecular hydrogen bonding. Among H₂S, H₂Se and H₂Te, increasing size and polarisability strengthen dispersion attractions down the group.

The overall order is H₂O > H₂Te > H₂Se > H₂S, option (3).

Create a free account to view solution

View Solution Free
Topic: p-Block elements·Practice all p-Block elements questions

More p-Block elements Questions

Sodium sulphate is soluble in water, whereas, whereas barium sulphate is sparingly soluble because :...Cold solution of barium nitrite on mixing with sulphuric acid produces :...Borax is prepared by treating colemanite with :...In the following reaction : B (OH)3 + H2O → [B(OH)4]- + H+:...Compound used in safety Matches is :...