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%

3067

Canada

27%

45%

15%

Germany

14%

19%

43%

22%

500

the United States

15%

23%

43%

16%

291

Austria

15%

27%

43%

13%

Malaysia

25%

43%

Vietnam

35%

42%

21%

the United Kingdom

13%

30%

40%

15%

171

Greece

28%

38%

28%

Switzerland

24%

16%

35%

21%

India

18%

30%

33%

14%

532

Republic of Ireland

12%

43%

31%

12%

Ghana

20%

33%

30%

16%

Nigeria

24%

21%

27%

26%

118

the Philippines

20%

28%

26%

22%

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?