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Grade: 10
Why bond angle vary sometime it will 109.28, 107,105.?
7 months ago

Answers : (2)

Ravleen Kaur
askIITians Faculty
1455 Points
							This is based on VSEPR theory. Due to l.p and b.p repulsions the bond angle changes in sp3.

Please go through our revision notes.
7 months ago
Vikas TU
10430 Points
Dear student 
vBond angles mainly depend on the following  factors:
Hybridization: Bond angle depends on the state of hybridization of the central atom
Hybridization: sp3, Bond angle: 109∘, Example: CH4
Hybridization: sp2, Bond angle: 120∘, Example: BCl3
Hybridization: sp, Bond angle: 180∘, Example: BeCl2
Generally s- character increase in the hybrid bond, the bond angle increases.
Lone pair repulsion: Bond angle is affected by the presence of lone pair of electrons at the central atom. A lone pair of electrons at the central atom always tries to repel the shared pair (bonded pair) of electrons. Due to this, the bonds are displaced slightly inside resulting in a decrease of bond angle.
Electronegativity: If the electronegativity of the central atom decreases, bond angle decreases.
7 months ago
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