Which among following is an acid ? 

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NPCIL Stipendiary Trainee (Category-II) Official Paper (Held On: 11 Jun 2019)
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  1. HCI
  2. NaCI
  3. KOH
  4. PbSO4

Answer (Detailed Solution Below)

Option 1 : HCI
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Detailed Solution

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The correct answer is 1) HCl.

Key Points

  • Hydrochloric acid (HCl) is a strong acid commonly found in the stomach, where it aids in digestion.
  • HCl is widely used in various industrial processes, including the production of chlorides, fertilizers, and dyes.
  • In laboratories, HCl is used as a reagent for titrations and pH control.
  • HCl is a colorless and highly corrosive liquid with a pungent smell.

Additional Information

  • Acid: A substance that releases hydrogen ions (H+) when dissolved in water, resulting in a pH less than 7.
  • Strong Acid: An acid that completely dissociates in water, releasing all its hydrogen ions.
  • pH Scale: A scale used to measure the acidity or basicity of a solution, ranging from 0 (highly acidic) to 14 (highly basic), with 7 being neutral.
  • Corrosive Substance: A chemical that can cause damage to living tissue or materials through chemical reactions.
  • Laboratory Reagent: A substance used in chemical reactions to detect, measure, or produce other substances.
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