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  9. Q8

OPSC OCS 2025 · Question 8 of 84

Assertion (A): (2025) Increasing atmospheric CO₂ reduces carbonate ion availability in seawater. __________________________________________________________ Reason (R): Dissolved CO₂ forms carbonic acid, which releases hydrogen ions that bind with carbonate ions. Options:

Science & Tech

  1. ABoth A and R are correct and R correctly explains ACorrect
  2. BBoth A and R are correct but R does not explain A
  3. CA is correct but R is incorrect
  4. DA is incorrect but R is correct

Answer: A. Both A and R are correct and R correctly explains A

Explanation

When atmospheric CO₂ increases: 1. More CO₂ dissolves in oceans.

Source: OPSC OCS Prelims 2025 GS Paper-I (Set D); answers per Apti Plus unofficial key

← Q7View full paper (84 questions)Q9 →

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