Which of these compounds is acid?

H2O
NaBr
HCOOH
CaO
It is a formic acid formula.
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H2O
NaBr
HCOOH
CaO
answers
flagIndia
0%
6%
90%
2%
171
flagAustralia
6%
3%
89%
0%
29
flagPakistan
0%
5%
85%
5%
20
flagGreece
0%
7%
84%
7%
13
flagAustria
4%
12%
79%
4%
24
flagUkraine
4%
8%
79%
4%
24
flagPoland
3%
13%
78%
4%
6524
flagRussia
0%
6%
78%
12%
32
flagGermany
2%
15%
76%
2%
109
flagthe United Kingdom
0%
19%
76%
2%
42
flagEstonia
0%
27%
72%
0%
11
flagNigeria
7%
21%
71%
0%
14
flagthe United States
3%
25%
58%
9%
102