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
flagBelarus
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0%
93%
6%
15
flagIndia
0%
7%
88%
3%
211
flagAustralia
6%
6%
87%
0%
33
flagFrance
0%
6%
87%
6%
16
flagEstonia
0%
13%
86%
0%
22
flagPakistan
3%
3%
85%
3%
27
flagGreece
0%
7%
85%
7%
14
flagthe United Kingdom
1%
10%
82%
3%
82
flagItaly
1%
16%
80%
2%
75
flagPoland
3%
13%
78%
4%
7210
flagUkraine
6%
6%
78%
6%
32
flagGermany
3%
14%
77%
2%
224
flagNigeria
12%
12%
72%
4%
50
flagAustria
4%
20%
70%
4%
44
flagRussia
3%
12%
69%
6%
62
flagKazakhstan
7%
15%
69%
7%
13
flagthe Philippines
0%
15%
69%
15%
13
flagSwitzerland
6%
26%
66%
0%
15
flagthe United States
2%
23%
64%
7%
139
flagSpain
6%
26%
60%
0%
15