Which of the following is not an allotropic variety of coal?

diamond
graphite
fullerene
anthracite
An al­lotropy is a phe­nom­e­non of ap­pear­ing, in the same state of ag­gre­ga­tion, of all sorts va­ri­eties of the same chemical element, dif­fer­ing in physical prop­er­ties and chem­i­cal. Coal is ap­pear­ing mainly in the form of diamond, graphite, fullerene and graphene. An­thracite is simply a variety of the hard bi­tu­mi­nous coal.

Answers distribution

diamond
graphite
fullerene
anthracite
answers
flagthe United Arab Emirates
7%
14%
14%
64%
14
flagAustralia
4%
13%
27%
54%
22
flagIndia
10%
7%
29%
51%
192
flagSingapore
8%
16%
33%
41%
12
flagPoland
11%
10%
37%
40%
5120
flagNorway
20%
10%
30%
40%
20
flagthe Philippines
8%
8%
45%
37%
24
flagthe United States
10%
18%
33%
36%
275
flagthe United Kingdom
12%
15%
35%
36%
172
flagPakistan
20%
20%
25%
35%
20
flagUnknown
11%
12%
42%
34%
373
flagGermany
17%
17%
32%
32%
64
flagItaly
7%
7%
53%
30%
13
flagthe Netherlands
20%
20%
30%
30%
10
flagRepublic of Ireland
0%
36%
36%
27%
11
flagFrance
21%
10%
42%
26%
19
flagCanada
17%
17%
43%
21%
23
flagNigeria
10%
10%
70%
10%
10

Gender

men37%
women36%
diamond
11%
11%
graphite
10%
12%
fullerene
41%
38%
anthracite
37%
36%

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Which of the following is not an allotropic variety of coal?
825
42%

Details

Author: Paweł Kołodziejczyk
Illustration: Jeffrey Beall
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