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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
flagBelarus
0%
0%
93%
6%
16
flagIndia
0%
7%
88%
3%
212
flagEstonia
0%
12%
88%
0%
25
flagItaly
0%
10%
87%
1%
119
flagAustralia
6%
6%
87%
0%
33
flagFrance
0%
6%
87%
6%
16
flagPakistan
3%
3%
85%
3%
27
flagGreece
0%
7%
85%
7%
14
flagthe United Kingdom
1%
10%
84%
3%
96
flagGermany
3%
12%
80%
2%
266
flagPoland
3%
13%
78%
3%
7269
flagUkraine
6%
6%
78%
6%
32
flagNigeria
12%
12%
72%
4%
50
flagAustria
4%
20%
70%
4%
44
flagRussia
3%
12%
69%
6%
65
flagthe Philippines
0%
15%
69%
15%
13
flagKazakhstan
7%
15%
69%
7%
13
flagthe United States
2%
21%
67%
6%
158
flagSwitzerland
6%
26%
66%
0%
15
flagSpain
6%
25%
62%
0%
16

What is the strongest known acid?

sulphuric acid
chloric acid
nitric acid
fluoroantimonic acid

What is the effect of nicotinic acid on human organism?

it is neutral
It is harmful, causes cancer
It is highly toxic, kills in 10 seconds
It is essential for functioning

Which acid is used for the production of explosives?

sulphuric acid
nitric acid
hydrochloric acid
boric acid

Which inventor is shown in the picture?

James Watt
George Stephenson
Louis Lumiere
Thomas Alva Edison