Answer:
B. Secondary pollutant
Explanation:
A primary pollutant is directly emitted into the atmosphere. Volcano eruptions and emissions from cars can result in primary pollutants in the air.
Secondary pollutants are not directly put in the atmosphere. They are created when two or more primary pollutants in the atmosphere react. One example is smog.
Another example is acid rain. If sulphur dioxide, nitrogen dioxide and water react, then acid rain is formed. Therefore, acid rain must be a secondary pollutant.
The best answer choice is B. secondary pollutant
halogens
Group 7A (or VIIA) of the periodic table are the halogens: fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At).
Na is the symbol for sodium.
Aqueous solutions exhibits properties that cannot be found in pure liquids called the colligative properties. These properties are being affected by the presence of solute particles in the solution. The properties are the boiling point elevation, freezing point depression, osmotic pressure elevation and vapor pressure lowering. These properties are directly related to the concentration of the solute. Thus, as the concentration increases, the value of the properties would as well increase. For the case of freezing point, the solution which would contain more solute particles or highest concentration would be the solution that will have the lowest freezing point.