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Can't tell u in general if a or b, depends on what AB2 is, e.g. CO2 is linear, H2O is tent shaped (corner at midst atom: 105o) but not trigonal as you'd call it.

Anyhow c, d, E are unusual for tri-atomic.

H2O is not in the form AB2. When in the form AB2 the ideal bond angle is 180 degrees or linear.

See the link below.

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12y ago

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