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
flagSwitzerland
38%
55%
5%
0%
18
flagGreece
25%
50%
6%
18%
16
flagPoland
39%
46%
8%
4%
10368
flagthe United Arab Emirates
41%
41%
8%
8%
12
flagthe United Kingdom
40%
40%
7%
10%
209
flagAustralia
38%
40%
6%
13%
72
flagUnknown
43%
40%
8%
8%
37
flagNigeria
39%
39%
10%
10%
68
flagGermany
51%
38%
3%
5%
156
flagthe United States
40%
37%
9%
10%
579
flagPakistan
45%
37%
4%
10%
66
flagthe Netherlands
64%
35%
0%
0%
17
flagIndia
47%
30%
11%
10%
568
flagGhana
53%
30%
7%
7%
13
flagCanada
60%
23%
6%
9%
43
flagMalaysia
55%
22%
11%
11%
27
flagAustria
51%
22%
18%
7%
27
flagthe Philippines
42%
21%
5%
26%
57
flagSingapore
71%
14%
4%
9%
21