Which is NOT a sign of a neutralization reaction?

Which is NOT a sign of a neutralization reaction?

• A. Precipitation
• B. Evolution of Gas
• C. Change or formation of color
• D. Photochemical degradation

Answer: (D)

Neutralization is an acid-base reaction that yields water and a salt. You can often tell it’s happening if you see a precipitate form when the product salt is insoluble, if gas bubbles appear when the reaction produces a gaseous product like CO2 or H2, or if a color change occurs when using an indicator or when the product salt has a different color in solution. Photochemical degradation, by contrast, involves breakdown of a substance due to light and isn’t tied to the acid–base reaction itself. So photochemical degradation is not a sign of a neutralization reaction.

Neutralization is an acid-base reaction that yields water and a salt. You can often tell it’s happening if you see a precipitate form when the product salt is insoluble, if gas bubbles appear when the reaction produces a gaseous product like CO2 or H2, or if a color change occurs when using an indicator or when the product salt has a different color in solution. Photochemical degradation, by contrast, involves breakdown of a substance due to light and isn’t tied to the acid–base reaction itself. So photochemical degradation is not a sign of a neutralization reaction.