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Question

Which one of the following statements about water is false?


  1. Water is oxidized to oxygen during photosynthesis

  2. Water can act both as an acid and as a base

  3. Ice formed by heavy water sinks in normal water

  4. There is extensive intramolecular hydrogen bonding in the condensed phase

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Solution

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:

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.


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