Which of these compounds is acid?

H2O
NaBr
HCOOH
CaO
It is a formic acid formula.
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Answers by country

H2O
NaBr
HCOOH
CaO
answers
flagIndia
0%
6%
91%
2%
150
flagPakistan
0%
0%
90%
0%
11
flagAustralia
7%
3%
88%
0%
27
flagAustria
4%
4%
85%
4%
21
flagGreece
0%
7%
84%
7%
13
flagUkraine
4%
4%
80%
4%
21
flagEstonia
0%
20%
80%
0%
10
flagGermany
3%
11%
79%
2%
78
flagPoland
2%
13%
78%
4%
6329
flagRussia
0%
6%
75%
13%
29
flagthe United Kingdom
0%
22%
72%
2%
36
flagthe United States
4%
25%
57%
10%
97