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.

wikimedia wikipedia → Liquid oxygen

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Answers by country

France

23%

70%

the Netherlands

13%

66%

13%

Australia

15%

55%

13%

Poland

12%

24%

45%

17%

3100

Canada

27%

45%

15%

the United States

15%

22%

44%

16%

296

Germany

14%

19%

43%

22%

509

Malaysia

25%

43%

Austria

14%

28%

42%

13%

Vietnam

35%

42%

21%

the United Kingdom

13%

30%

40%

15%

172

Greece

28%

38%

28%

Switzerland

23%

15%

36%

21%

India

18%

30%

33%

15%

533

Republic of Ireland

12%

43%

31%

12%

Ghana

20%

33%

30%

16%

Nigeria

24%

21%

27%

26%

118

the Philippines

21%

28%

26%

21%

Singapore

15%

30%

25%

30%

Pakistan

20%

26%

24%

28%

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Which chemical element forms compounds which are typically intensely colored?

Which of the following is not a chemical element?

What numbers do NOT exist in Mathematics?