Multiple choice

Which one of the following indicates the correct order of acidic strength of following acids?

I - HCOOH (Ka = 1.8 × 10-4) II - CH3COOH (Ka = 1.8 × 10-5) III - HCN (Ka = 4.8 × 10-10) IV - HS- (Ka = 1 × 10-14)

  1. I > II > III > IV

  2. IV > III > II > I

  3. I > III > II > IV

  4. I > II > IV > III
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct as we know that higher the value of Ka higher will be the strength of the acid. Hence, in the given question the highest value of Ka is for HCOOH followed by CH3COOH, HCN, HS- etc.

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