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Model Paper 8 — Chemistry STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 ScienceChemistryModel Paper 83 Marks
Question
Predict the dipole moment of
i. a molecule of the type $AX _2$ having a linear geometry.
ii. a molecule of the type $AX _4$ having tetrahedral geometry.
iii. a molecule of the type $AX _2$ having angular geometry.
iv. a molecule of the type $AX _4$ having square planar geometry.
✓

Answer

i. In $AX _2$ molecule with a linear geometry, the individual bond moments of $A - X$ bonds will cancel being equal in magnitude and opposite in direction. This will cause the overall dipole moment of the molecule to be 0 .
ii. In $AX _4$ molecule having tetrahedral geometry, the individual dipole moments of $A - X$ bonds will cancel out being equal in magnitude and opposite in direction. This will cause the overall dipole moment of the molecule to be zero.
iii. In $AX _2$ molecule having angular geometry, the individual bond moments of $A - X$ bonds will add up and thus the molecule will have a net non-zero dipole moment.
iv. In $AX _4$ molecule having square planar geometry the individual dipole moments of $A - X$ bonds will cancel out being equal in magnitude and opposite in direction. This will cause the overall dipole moment of the molecule to be zero.

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