Question

The \( K_a \) values of A, B, and C are \( 1.8 \times 10^{-4} \), \( 5 \times 10^{-10} \), and \( 3 \times 10^{-8} \), respectively.
The correct order of their acidic strength is:

• A. B>A>C
• B. B>C>A
• C. A>B>C
• D. A>C>B

Hint:

Greater \( K_a \Rightarrow \) stronger acid. Compare exponent values carefully.

Answer 1

The Correct Option is D

Acid strength increases with higher \( K_a \) value.
Given: - A: \( 1.8 \times 10^{-4} \)
- C: \( 3 \times 10^{-8} \)
- B: \( 5 \times 10^{-10} \)
Order: \[ A>C>B \]