Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire ?

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Q: (CDS-I/2021)

Which one of the following metals is kept immersed in Kerosene oil to protect it and to prevent accidental fire ?
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question_subject: 

Science

question_exam: 

CDS-I

stats: 

0,71,25,3,71,14,8

keywords: 

{'kerosene oil': [0, 0, 0, 2], 'metals': [1, 2, 2, 7], 'magnesium': [1, 0, 2, 3], 'sodium': [10, 2, 12, 23], 'vanadium': [1, 0, 0, 1], 'calcium': [2, 0, 0, 4], 'accidental fire': [0, 0, 0, 2]}