Which element is blue in liquid state?
hydrogen
nitrogen
oxygen
helium
Liquid oxygen has a pale blue color and is strongly paramagnetic. The first measurable quantity of liquid oxygen was produced by Polish professors Zygmunt Wróblewski and Karol Olszewski (Jagiellonian University in Kraków) on April 5, 1883.
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Answers by country
hydrogen
nitrogen
oxygen
helium
answers
France
17
the Netherlands
15
Australia
84
Poland
3073
Canada
33
Germany
503
the United States
291
Austria
86
Malaysia
16
Vietnam
14
the United Kingdom
172
Greece
21
Switzerland
37
India
532
Republic of Ireland
16
Ghana
30
Nigeria
118
the Philippines
45
Singapore
20
Pakistan
53