What makes a molecule polar?
O
A. Nonpolar covalent bonds within the molecule that cancel out
O
B. Ionic bonds between atoms of different electronegativities
O
C. Bonds between atoms of the same electronegativity
O
D. Polar covalent bonds within the molecule that are not symmetric

D. Polar covalent bonds within the molecule that are not symmetric

Explanation:

Polar and non polar molecules only occur in covalent bonds and the atoms in the bond are not symmetrical. There is also a difference in electronegativity.

it means there are 3 atoms of oxygen

a saline water is fed to a reverse osmosis unit at flow rate o rotameter connected to reject (retentate) line reads 8 installed in reject and permeate line reads 15.2 milli siemens/cm and 300 micro siemens/com respectively.