Which one of the following metals does not form amalgams ?

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Q: 107 (IAS/1998)
Which one of the following metals does not form amalgams ?
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question_subject: 

Science

question_exam: 

IAS

stats: 

0,45,60,14,21,25,45

keywords: 

{'metals': [1, 2, 2, 7], 'amalgams': [0, 1, 0, 0], 'zinc': [1, 0, 0, 2], 'magnesium': [1, 0, 2, 3], 'copper': [1, 0, 1, 1], 'iron': [0, 0, 1, 1]}