NDA General Ability Question (2025) — Solution

Step-by-step solution

Oxidation is defined as the gain of oxygen or the loss of hydrogen by a substance during a chemical reaction. Reduction is defined as the loss of oxygen or the gain of hydrogen by a substance during a chemical reaction. Evaluating the given options: Option (1) states that if a substance loses hydrogen, it is reduced. This is incorrect because the loss of hydrogen is oxidation. Option (2) states that losing oxygen is reduction, which is correct. Option (3) states that gaining hydrogen is reduction, which is correct. Option (4) states that gaining oxygen is oxidation, which is correct. Therefore, the statement in option (1) is not correct. Answer: If a substance loses hydrogen during reaction, it is reduced