Which one of the following elements exists in liquid state at room temperature?

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Q: 83 (NDA-II/2009)

Which one of the following elements exists in liquid state at room temperature?
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question_subject: 

Science

question_exam: 

NDA-II

stats: 

0,49,3,49,0,1,2

keywords: 

{'liquid state': [0, 0, 1, 1], 'elements': [0, 0, 2, 5], 'mercury': [0, 0, 2, 2], 'sodium': [10, 2, 12, 23], 'calcium': [2, 0, 0, 4], 'room temperature': [0, 0, 5, 6], 'lead': [7, 1, 11, 11]}