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Question

Acetic acid is a weak acid because


  1. its aqueous solution is acidic.

  2. it is highly ionized.

  3. it is weakly ionized

  4. it contains -COOH group

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Solution

The correct option is C

it is weakly ionized


The explanation for the correct option:

(3)

  • Weak acids are those which do not ionize completely to release Hydrogen ions (H+) when dissolved in water.
  • Since Acetic acid (CH3COOH) is a weak acid, it is weakly or partially ionized in water.

The explanation for incorrect options:

  • (1) According to the definition of acids, both weak and strong acids form acidic solutions, when dissolved in Water.
  • (2) Weak acids are weakly or partially ionized and not completely or highly ionized.
  • (4) The functional group (-COOH) does not determine the strength of an acid.

Final Answer: Hence, option (3) is correct. Acetic acid is a weak acid because it is weakly ionized.



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