Paper 1 · People, Development and Environment
UGC NET December 2023 (08.12.2023) Shift-I
Given below are two statements. In the light of the above statements, choose the most appropriate answer from the options given below.
- Statement I: When a hazardous waste has either a high or a low pH value, it must be treated for neutralization before discharge.
- Statement II: Sulfuric acid and hydrochloric acid are added to hazardous waste with a low pH value to neutralize it.
ABoth Statement I and Statement II are correct
BBoth Statement I and Statement II are incorrect
CStatement I is correct but Statement II is incorrect ✓ Correct
DStatement I is incorrect but Statement II is correct
Correct answer: (C) Statement I is correct but Statement II is incorrect — Statement I is correct but Statement II is incorrect, so that is the answer.
Explanation
★Statement I is correct but Statement II is incorrect, so that is the answer.
★Hazardous waste that is strongly acidic or strongly alkaline must be neutralized before discharge.
★Neutralization uses a controlled reaction to bring the pH near neutral, so Statement I is correct.
★A low pH value means the waste is already acidic.
★Adding acids like sulfuric or hydrochloric would make it more acidic, not neutralize it.
★An acidic waste is neutralized with a base, so Statement II is incorrect.
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