Which of the following chlorine oxoacids is the strongest?

HClO
HClO2
HClO3
HClO4
With the same central atom, acid strength increases as the number of oxygens attached to it increases, so perchloric acid (HClO4) is the strongest.
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Answers by country

HClO
HClO2
HClO3
HClO4
answers
flagMalaysia
18%
0%
0%
81%
11
flagIndia
9%
11%
12%
66%
185
flagGermany
14%
4%
14%
66%
21
flagAustralia
5%
11%
23%
58%
17
flagNigeria
30%
10%
10%
50%
10
flagPoland
22%
12%
15%
48%
1441
flagthe United Kingdom
24%
12%
18%
45%
33
flagthe United States
15%
14%
23%
44%
78
flagthe Philippines
12%
6%
25%
43%
16
flagPakistan
35%
7%
21%
35%
14