Question

Which of the following is a weak electrolyte?

• A. $H_{2}CO_{3}$
• B. $H_{2}SO_{4}$
• C. $NaCl$
• D. $NaOH$

Hint:

Weak acids (like $H_{2}CO_{3}$ or vinegar) and weak bases are always weak electrolytes.

Answer 1

The Correct Option is A

Step 1: Concept
A weak electrolyte is a substance that only partially ionizes or dissociates in aqueous solution.

Step 2: Meaning
$H_{2}SO_{4}, NaCl,$ and $NaOH$ are strong electrolytes because they dissociate almost completely into ions.

Step 3: Analysis
Carbonic acid ($H_{2}CO_{3}$) is a weak acid and therefore does not ionize fully, leaving mostly neutral molecules in the solution.

Step 4: Conclusion
$H_{2}CO_{3}$ is the weak electrolyte.
Final Answer: (A)