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%
10344
flagthe United Arab Emirates
41%
41%
8%
8%
12
flagthe United Kingdom
40%
40%
7%
10%
209
flagGermany
49%
40%
4%
6%
147
flagAustralia
38%
40%
6%
13%
72
flagUnknown
43%
40%
8%
8%
37
flagNigeria
39%
39%
10%
10%
68
flagthe United States
41%
37%
9%
10%
574
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
flagAustria
53%
23%
19%
3%
26
flagMalaysia
55%
22%
11%
11%
27
flagthe Philippines
42%
21%
5%
26%
57
flagSingapore
71%
14%
4%
9%
21