Which one among the following will you put into pure water in order to pass electric current through it ?

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Q: 104 (CDS-II/2011)
Which one among the following will you put into pure water in order to pass electric current through it ?
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question_subject: 

Science

question_exam: 

CDS-II

stats: 

0,21,11,1,1,21,9

keywords: 

{'pure water': [0, 0, 0, 1], 'kerosene': [2, 2, 3, 2], 'lemon juice': [0, 0, 2, 3], 'mustard oil': [0, 0, 1, 0], 'electric current': [0, 1, 0, 6], 'sugar': [0, 0, 0, 1]}