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Which of the following is not a chemical element?

iridium
limestone
tungsten
tin
Iridium, tungsten and tin are chemical elements. Limestone is a common sedimentary rock composed mainly of skeletal fragments of marine organisms.
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Answers by country

iridium
limestone
tungsten
tin
answers
flagFrance
0%
100%
0%
0%
16
flagRepublic of Ireland
0%
93%
6%
0%
15
flagSwitzerland
5%
88%
0%
5%
17
flagAustria
9%
87%
3%
0%
31
flagCanada
0%
86%
5%
7%
38
flagthe United Kingdom
5%
83%
4%
6%
202
flagGermany
3%
83%
5%
5%
201
flagthe Philippines
7%
83%
7%
1%
54
flagSingapore
7%
82%
3%
7%
28
flagMalaysia
3%
82%
7%
3%
28
flagUnknown
8%
80%
8%
2%
46
flagthe United States
4%
78%
7%
9%
426
flagGhana
8%
78%
8%
4%
23
flagIndia
10%
74%
6%
6%
525
flagthe Netherlands
5%
70%
0%
23%
17
flagNigeria
11%
69%
8%
10%
69
flagAustralia
15%
68%
5%
8%
70
flagGreece
0%
68%
15%
15%
19
flagPoland
17%
60%
11%
10%
12304
flagPakistan
16%
55%
13%
13%
59

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