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Class 11 Exam  >  Class 11 Questions  >  The statement that is true about H2O molecule... Start Learning for Free
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The statement that is true about H2O molecule is:
  • a)
    It has T-shaped geometry and two lone pair of electrons.
  • b)
    It has V-shaped geometry and two lone pair of electrons.
  • c)
    It has tetrahedral geometry and no lone pair of electrons.
  • d)
    It has pyramidal geometry and one lone pair of electrons.
Correct answer is option 'B'. Can you explain this answer?
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Verified Answer
The statement that is true about H2O molecule is:a)It has T-shaped geo...
Central atom: O
At. no. = 8,
No. of valence electrons in oxygen is 6
Lewis dot structure of O atom
No. of electrons required for completing the octet = 8 - 6 =2
Atoms attached to the central atom: two H atoms
At. no. of H = 1
H atoms need one electron each for getting fully-filled K shells.
Representation of Lewis dot structures of H2O, which satisfies these conditions:
 
No. of valence shell electron pairs on the central atom O, after forming two covalent bonds with two H atoms = 4.
Geometry of 4 pairs, as predicted by VSEPR theory = Tetrahedral.
No. of lone pairs = Two.
Type, according to VSEPR theory:
So, geometry of pairs and geometry of atoms are different.
The geometry of atoms is derived from the geometry of pairs. At two of the four corners of the tetrahedron, there are no atoms.
Diagrams showing the geometry of 2 H atoms and two lone pairs:
 
Geometry of atoms in H2O is V-shaped. i.e. H2O molecule has a bent geometry
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Most Upvoted Answer
The statement that is true about H2O molecule is:a)It has T-shaped geo...
The true statement about the H2O molecule is that it has V-shaped geometry and two lone pair of electrons.

Explanation:
Geometry of H2O molecule:
The H2O molecule consists of two hydrogen atoms bonded to an oxygen atom. The oxygen atom is the central atom, and it is surrounded by two hydrogen atoms. The electron arrangement in the H2O molecule is known as a bent or V-shaped geometry.

Valence Shell Electron Pair Repulsion (VSEPR) Theory:
The VSEPR theory helps us predict the geometry of molecules based on the repulsion between electron pairs. According to this theory, the electron groups (bonded atoms and lone pairs) around the central atom will arrange themselves in a way that minimizes the repulsion between them.

Geometry of H2O molecule:
In the case of the H2O molecule, the oxygen atom has two bonding pairs of electrons (the two O-H bonds) and two lone pairs of electrons. The presence of lone pairs of electrons affects the geometry of the molecule. The repulsion between the lone pairs and the bonding pairs causes the molecule to adopt a V-shaped or bent geometry.

Explanation of options:
Let's evaluate each option to determine the correct statement about the H2O molecule:

a) It has T-shaped geometry and two lone pair of electrons.
This option is incorrect because the H2O molecule does not have a T-shaped geometry. The T-shaped geometry is observed in molecules with three bonding pairs and two lone pairs of electrons, such as in ClF3.

b) It has V-shaped geometry and two lone pair of electrons.
This option is correct. As explained earlier, the H2O molecule has a V-shaped or bent geometry and two lone pairs of electrons.

c) It has tetrahedral geometry and no lone pair of electrons.
This option is incorrect because the H2O molecule does not have a tetrahedral geometry. Tetrahedral geometry is observed in molecules with four bonding pairs and no lone pairs of electrons, such as in CH4.

d) It has pyramidal geometry and one lone pair of electrons.
This option is incorrect because the H2O molecule does not have a pyramidal geometry. Pyramidal geometry is observed in molecules with three bonding pairs and one lone pair of electrons, such as in NH3.

Therefore, the correct statement is option 'B': The H2O molecule has V-shaped geometry and two lone pair of electrons.
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Community Answer
The statement that is true about H2O molecule is:a)It has T-shaped geo...
Yes 2nd option is corret because, after forming 2 bonds with hydrogen atoms oxygen still has 2 lone pairs left. That's why if we see the hybridisation of H*2O it is sp3 hybridised having 2 lone pairs. And hence it has V- shape.
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The statement that is true about H2O molecule is:a)It has T-shaped geometry and two lone pair of electrons.b)It has V-shaped geometry and two lone pair of electrons.c)It has tetrahedral geometry and no lone pair of electrons.d)It has pyramidal geometry and one lone pair of electrons.Correct answer is option 'B'. Can you explain this answer?
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