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

Answers : (2)

Ravleen Kaur
askIITians Faculty
1451 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.
10 months ago
Vikas TU
11685 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.
10 months ago
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