Question

9. The sculptors and monuments get damaged due to acid rains. Usage of scrubbers, containing lime water, in industries, decreases the percentage content of the major air pollutants that contribute to acid rain. The characteristic reaction involved in the scrubber is

• A. neutralization
• B. oxidation
• C. reduction
• D. combination followed by decomposition

Answer 1

The correct option is A

neutralization

Explanation:

• The gases like Nitrogen dioxide $\left({\mathrm{NO}}_2\right)$ and Sulphur dioxide $\left({\mathrm{SO}}_2\right)$ that are released from factories, burning of fossil fuels, etc. dissolve in rainwater and form corresponding acids. This rain when reaches in earth's surface is called acid rain.
• The sculptors and monuments get damaged due to acid rains.
• Nitrogen dioxide and Sulphur dioxide percentage content in the atmosphere is reduced by using scrubbers. Scrubbers contain Lime or Calcium hydroxide $\left(\mathrm{Ca}{\left(\mathrm{OH}\right)}_2\right)$ which combines with Sulphur dioxide to form a salt.
• The reaction involved is: $\underset{\mathrm{Lime}\mathrm{water}\left(\mathrm{basic}\right)}{\mathrm{Ca}{\left(\mathrm{OH}\right)}_2}+\underset{\mathrm{Sulphur}\mathrm{oxide}(\mathrm{acidic}\mathrm{oxide})}{{\mathrm{SO}}_2}\to \underset{\mathrm{Calcium}\mathrm{sulphite}}{{\mathrm{CaSO}}_3}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}}$
• The characteristic reaction involved in the scrubber is the neutralization reaction.

Hence, option (A) is the correct answer.