Question

What is the number of oxygen atoms bonded to chlorine in its strongest oxoacid?

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

Oxoacid strength rule: More Oxygen Atoms $\rightarrow$ Higher Oxidation State $\rightarrow$ Stronger Acid! For chlorine: $\text{HClO} < \text{HClO}_2 < \text{HClO}_3 < \text{HClO}_4$.

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The strength of oxoacids of the same central atom increases with the increase in the oxidation state of the central atom and the number of oxygen atoms attached to it.

Step 2: Formula Application:
Chlorine's oxoacids are $HOCl$, $HClO_2$, $HClO_3$, and $HClO_4$. The strongest among these is Perchloric acid ($HClO_4$).

Step 3: Explanation:
In $HClO_4$, the central Chlorine atom is bonded to 4 oxygen atoms (one $-OH$ group and three $=O$ oxo groups). The high oxidation state (+7) makes it a very strong acid.

Step 4: Final Answer:
There are 4 oxygen atoms bonded to Chlorine in $HClO_4$.