What is the chemical formula of dry ice? (also known as cardice)

H₂O
CO₂
CH₄
HCOOH
Dry ice is the solid form of carbon dioxide. In temperatures above −78.5 °C (−109.3 °F) it will not melt but sublimate, that means transforming straight from solid form into gas one without liquid phase.
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Answers by country

H₂O
CO₂
CH₄
HCOOH
answers
flagMalaysia
0%
80%
12%
8%
25
flagUnknown
5%
74%
8%
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35
flagIndia
8%
72%
6%
11%
455
flagPakistan
13%
65%
1%
18%
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flagAustralia
1%
64%
11%
21%
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flagFrance
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64%
14%
7%
14
flagthe United Arab Emirates
9%
63%
27%
0%
11
flagSingapore
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63%
18%
18%
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flagthe United States
3%
62%
15%
16%
226
flagthe United Kingdom
14%
54%
11%
18%
111
flagAustria
9%
52%
9%
28%
21
flagPoland
13%
44%
17%
23%
7282
flagthe Philippines
2%
42%
21%
33%
42
flagGermany
11%
41%
20%
26%
145
flagNigeria
13%
41%
13%
27%
36
flagGreece
0%
35%
5%
58%
17
flagSwitzerland
14%
35%
7%
42%
14
flagCanada
12%
31%
31%
25%
16