Which gas is colorless and odorless?

ozone
methane
benzene
ammonia
Methane is the main component of natural gas piped into homes for domestic heating and cooking purposes. In order to assist in detecting leaks, a sulphur-like odorant is added the gas used by consumers.
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Answers by country

ozone
methane
benzene
ammonia
answers
flagRomania
27%
72%
0%
0%
11
flagGreece
25%
50%
6%
18%
16
flagBangladesh
30%
50%
10%
10%
10
flagPoland
39%
46%
8%
4%
10120
flagFrance
18%
45%
27%
9%
11
flagNigeria
38%
44%
5%
11%
52
flagAustralia
40%
41%
5%
12%
70
flagUnknown
43%
40%
8%
8%
37
flagthe United Kingdom
41%
39%
8%
10%
199
flagPakistan
44%
39%
4%
9%
63
flagGermany
51%
37%
3%
7%
93
flagthe United States
41%
36%
9%
11%
564
flagthe Netherlands
68%
31%
0%
0%
16
flagIndia
47%
30%
11%
10%
549
flagIndonesia
63%
27%
0%
0%
11
flagCanada
57%
23%
7%
10%
38
flagMalaysia
55%
22%
11%
11%
27
flagthe Philippines
42%
21%
5%
26%
57
flagSingapore
75%
15%
5%
5%
20
flagAustria
66%
14%
19%
0%
21