Question

which of the molecules, co₂, nh₃ and bcl₃ will be polar?
co₂, nh₃ and bcl₃
co₂ and bcl₃
nh₃
co₂ and nh₃
bcl₃
you can use this periodic table during the quiz. however, as stated in the course outline, and in the orientation session, this quiz is not open book. you cannot access course material while you write the quiz. nor can you google your answers, work as a group, use a cheat sheet, etc

Explanation:

A polar molecule has a net dipole moment due to unequal sharing of electrons and asymmetric geometry.

• $\text{CO}_2$: Linear geometry ($\text{O=C=O}$), dipoles cancel → nonpolar.
• $\text{NH}_3$: Trigonal pyramidal geometry, lone pair on N creates asymmetric charge distribution → polar.
• $\text{BCl}_3$: Trigonal planar geometry, dipoles cancel → nonpolar.

Answer:

$\text{NH}_3$