Question

Each carbon oxygen bond co2 molecule is polar, but the molecule is itself is non polar. give reason

Answer 1

The bond may have polarity but the molecule is non-polar because there are 2 oxygen atoms of equal electronegativity pulling electron density from the carbon at 180 degrees from each other, resulting in no net differential charge in any direction in this linear symmetric triatomic molecule. By comparison, nitrous oxide, N=N=O, is a linear asymmetric polar molecule. Water H-O-H is a bent triatomic  molecule that is symmetric but is polar because the polar aspects of each bond do not cancel each other in all directions.