Is CO polar or nonpolar?

Answer:

CO (Carbon monoxide) is a polar molecule.Remember that if the dipole moment of a bond is symmetrically cancelled out by an equal and opposite dipole moment of another bond, then we get net molecular dipole moment zero.Thus the overall compound is non polar. Like in the case of C02  which is nonpolar.

In the case of CO,  the oxygen is more electronegative than carbon.That is why carbon-oxygen bond is polar.So this has bond dipole moment.

According to VSEPR theory,the shape of CO is linear.So,we are not getting anything that can cancel the bond  dipole moment of carbon-oxygen bond of linear CO molecule. Thus the net molecular dipole moment for CO molecule is not zero.Therefore ,CO (Carbon monoxide) is polar.