Which formulas represent two polar molecules? a) co2 and hcl b) co2 and ch4 c) h2o and hcl d) h2o and ch4

The correct option is C.
A polar molecule refers to a molecule that has a partially positive charge in one part of the molecule and a partially negative charge in the other part of the molecule. The polarity of water arises as a result of unequal sharing of electrons between the molecules of water.