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
flagGreece
0%
10%
0%
90%
10
flagMalaysia
9%
4%
4%
80%
21
flagAustralia
10%
8%
12%
68%
58
flagthe United Arab Emirates
16%
8%
8%
66%
12
flagVietnam
0%
25%
16%
58%
12
flagIndia
15%
13%
12%
56%
474
flagthe United Kingdom
18%
11%
12%
55%
127
flagAustria
18%
16%
11%
52%
53
flagPakistan
20%
11%
13%
52%
44
flagSwitzerland
20%
8%
20%
52%
25
flagPoland
21%
12%
16%
48%
3143
flagGermany
20%
10%
20%
48%
319
flagthe United States
21%
13%
20%
43%
195
flagSingapore
42%
7%
7%
42%
14
flagNigeria
29%
12%
15%
41%
82
flagthe Philippines
15%
12%
21%
40%
32
flagthe Netherlands
33%
6%
13%
40%
15
flagGhana
20%
13%
13%
40%
15
flagCanada
33%
16%
11%
38%
18