Statement-I: Bond angle of BF3 and NF3 are different.
Statement-II: BF3 and NF3 are having different shape.
Correct Answer :
Statement I and Statement II both are correct.
Solution :
To evaluate the two statements we compare the molecular geometry and bond angles of BF3 and NF3.
Step 1: Determine the shape of BF3
BF3 has three fluorine atoms bonded to a central boron atom. Boron provides three bonding pairs and no lone pairs. According to VSEPR theory, a molecule with three regions of electron density adopts a trigonal planar geometry. In a trigonal planar molecule the bond angles are all .
Step 2: Determine the shape of NF3
NF3 has three fluorine atoms and one lone pair on the central nitrogen atom. This gives four regions of electron density (three bonding pairs + one lone pair). VSEPR predicts a trigonal pyramidal shape, similar to NH3. The presence of the lone pair compresses the bond angle to about (slightly less than the ideal tetrahedral angle of ).
Step 3: Compare the bond angles (Statement I)
The bond angle in BF3 is while the bond angle in NF3 is roughly . Because these values are not equal, the statement “Bond angle of BF3 and NF3 are different” is true.
Step 4: Compare the shapes (Statement II)
BF3 is trigonal planar; NF3 is trigonal pyramidal. Since the two molecules adopt different geometrical arrangements, the statement “BF3 and NF3 are having different shape” is also true.
Thus both statements are correct, which matches the provided answer choice.
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