Statement I: The boiling points of the following hydrides of group 16 elements increases in the order - H2O < H2S < H2Se < H2Te
Statement II: The boiling points of these hydrides increases with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below:
Statement II: The boiling points of these hydrides increases with increase in molar mass.
In the light of the above statements, choose the most appropriate answer from the options given below:
- Both Statement I and Statement II are correct.
- Both Statement I and Statement II are incorrect.
- Statement I is correct but Statement II is incorrect.
- Statement I is incorrect but Statement II is correct.
The Correct Option is B
Solution and Explanation
The boiling points of hydrides usually increase with increasing molar mass because larger molecules have stronger van der Waals forces. However, H2O is an exception due to hydrogen bonding, which is much stronger than van der Waals forces. Let's analyze both statements:
- Statement I: It claims the boiling points increase in the order: H2O < H2S < H2Se < H2Te. This is incorrect because H2O has a higher boiling point than the others due to hydrogen bonding.
- Statement II: It suggests boiling points increase with molar mass. While generally true for hydrides, H2O is an exception, having a higher boiling point than others despite its lower molar mass due to strong hydrogen bonding. So, this statement is also incorrect when considering H2O.
Based on this analysis, both statements are incorrect. The correct answer is:
Both Statement I and Statement II are incorrect.
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Concepts Used:
P-Block Elements
- P block elements are those in which the last electron enters any of the three p-orbitals of their respective shells. Since a p-subshell has three degenerate p-orbitals each of which can accommodate two electrons, therefore in all there are six groups of p-block elements.
- P block elements are shiny and usually a good conductor of electricity and heat as they have a tendency to lose an electron. You will find some amazing properties of elements in a P-block element like gallium. It’s a metal that can melt in the palm of your hand. Silicon is also one of the most important metalloids of the p-block group as it is an important component of glass.
P block elements consist of:
- Group 13 Elements: Boron family
- Group 14 Elements: Carbon family
- Group 15 Elements: Nitrogen family
- Group 16 Elements: Oxygen family
- Group 17 Elements: Fluorine family
- Group 18 Elements: Neon family