Which is/are wrong statement (s) ?

Options

A. Arrhenius acids are also Bronsted acids but all Arrhenius bases are not Bronsted base
B. All Lewis bases are Bronsted bases
C. All Bronsted acids are Lewis acids
D. Conjugate base of a strong acid is weak

Answer

To determine which statements are incorrect regarding acids and bases according to different theories, we will analyze each statement step by step.

### Step 1: Analyze the First Statement
**Statement:** "Arrhenius acids are also Bronsted acids, but all Arrhenius bases are not Bronsted bases."

- **Arrhenius Acid:** According to Arrhenius theory, an acid is a substance that produces H⁺ ions in solution.
- **Bronsted Acid:** According to Bronsted-Lowry theory, an acid is a substance that donates H⁺ ions.

Since both definitions involve the donation of H⁺ ions, it is true that all Arrhenius acids are also Bronsted acids.

- **Arrhenius Base:** An Arrhenius base is a substance that produces OH⁻ ions in solution.
- **Bronsted Base:** A Bronsted base is a substance that accepts H⁺ ions.

It is possible for an Arrhenius base to not accept H⁺ ions, hence not all Arrhenius bases are Bronsted bases.

**Conclusion:** This statement is **correct**.

### Step 2: Analyze the Second Statement
**Statement:** "All Lewis bases are Bronsted bases."

- **Lewis Base:** A Lewis base is a substance that donates an electron pair.
- **Bronsted Base:** A Bronsted base is a substance that accepts H⁺ ions.

Not all Lewis bases necessarily accept H⁺ ions; they only need to donate electron pairs. Therefore, this statement is **incorrect**.

### Step 3: Analyze the Third Statement
**Statement:** "All Bronsted acids are Lewis acids."

- **Bronsted Acid:** A Bronsted acid donates H⁺ ions.
- **Lewis Acid:** A Lewis acid accepts electron pairs.

While many Bronsted acids can act as Lewis acids, it is not true that all Bronsted acids must accept electron pairs. Thus, this statement is also **incorrect**.

### Step 4: Analyze the Fourth Statement
**Statement:** "Conjugate base of a strong acid is weak."

According to Bronsted-Lowry theory, if an acid is strong, its conjugate base is weak. This statement is **correct**.

### Conclusion
The incorrect statements are:
- **B:** "All Lewis bases are Bronsted bases." (Incorrect)
- **C:** "All Bronsted acids are Lewis acids." (Incorrect)

### Final Answer
The wrong statements are **B and C**.

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