Question

According to Arrhenius theory of acids and bases, which of the following is an example of Arrhenius base?

• A. $H_{2}SO_{4}$
• B. $NH_{3}$
• C. $NaOH$
• D. $CaO$

Hint:

Arrhenius Base = Has OH in the formula and releases it in water.

Answer 1

The Correct Option is C

Step 1: Concept
Arrhenius theory states that an acid produces $H^{+}$ ions and a base produces $OH^{-}$ ions in aqueous solution.

Step 2: Meaning
We look for a substance that directly dissociates to release hydroxide ions ($OH^{-}$).

Step 3: Analysis
$NaOH$ dissociates in water as: $NaOH \to Na^{+} + OH^{-}$, thus satisfying the definition. $CaO$ and $NH_{3}$ are Lewis or Brønsted bases but not direct Arrhenius bases until they react with water.

Step 4: Conclusion
$NaOH$ is the classic Arrhenius base.
Final Answer: (C)