Which one of the following statements about water is false?
Water is oxidized to oxygen during photosynthesis
Water can act both as an acid and as a base
Ice formed by heavy water sinks in normal water
There is extensive intramolecular hydrogen bonding in the condensed phase
Which one of the following statements about water is false?
Water is oxidized to oxygen during photosynthesis
Water can act both as an acid and as a base
Ice formed by heavy water sinks in normal water
There is extensive intramolecular hydrogen bonding in the condensed phase
The correct option is D There is extensive intramolecular hydrogen bonding in the condensed phase
Explanation for correct option
(D) There is extensive intramolecular hydrogen bonding in the condensed phase
Water
- Water molecules have a polar structure as well as a bent overall shape.
- This is because oxygen is more electronegative than hydrogen, which means it attracts electrons better.
- Water is an excellent solvent.
- Structure of water molecule:
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Hydrogen bonding
- In the condensed phase, water has intermolecular hydrogen bonding rather than intramolecular hydrogen bonding.
- Hence the given statement is false.
Explanation for incorrect options
(A) Water is oxidized to oxygen during photosynthesis
- Plants absorb carbon dioxide and water from the air and soil during photosynthesis.
- Water is oxidized in the plant cell, which means it loses electrons, but carbon dioxide is reduced, which means it receives electrons.
- Water is converted to oxygen, while carbon dioxide is converted to glucose.
- Hence the given statement is true.
(B) Water can act both as an acid and as a base
- In solution, water may behave as both an acid and a base, and it can also be both an acid and a base to itself, a process known as autoionization.
- Hence the given statement is true.
(C) Ice formed by heavy water sinks in normal water
- In normal water, ice formed by heavy water sinks.
- Each heavy water molecule is somewhat larger than a standard water molecule.
- Thus heavy water molecules may pack closer together while forming ice than regular water molecules.
- Hence the given statement is true.
Therefore, the correct option is (D) There is extensive intramolecular hydrogen bonding in the condensed phase.
There is extensive intramolecular hydrogen bonding in the condensed phase
Explanation for correct option
(D) There is extensive intramolecular hydrogen bonding in the condensed phase
Water
- Water molecules have a polar structure as well as a bent overall shape.
- This is because oxygen is more electronegative than hydrogen, which means it attracts electrons better.
- Water is an excellent solvent.
- Structure of water molecule:
Hydrogen bonding
- In the condensed phase, water has intermolecular hydrogen bonding rather than intramolecular hydrogen bonding.
- Hence the given statement is false.
Explanation for incorrect options
(A) Water is oxidized to oxygen during photosynthesis
- Plants absorb carbon dioxide and water from the air and soil during photosynthesis.
- Water is oxidized in the plant cell, which means it loses electrons, but carbon dioxide is reduced, which means it receives electrons.
- Water is converted to oxygen, while carbon dioxide is converted to glucose.
- Hence the given statement is true.
(B) Water can act both as an acid and as a base
- In solution, water may behave as both an acid and a base, and it can also be both an acid and a base to itself, a process known as autoionization.
- Hence the given statement is true.
(C) Ice formed by heavy water sinks in normal water
- In normal water, ice formed by heavy water sinks.
- Each heavy water molecule is somewhat larger than a standard water molecule.
- Thus heavy water molecules may pack closer together while forming ice than regular water molecules.
- Hence the given statement is true.
Therefore, the correct option is (D) There is extensive intramolecular hydrogen bonding in the condensed phase.
