Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is. mercury used .in the manufacture of these lamps ?

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Q: 138 (IAS/2010)
Indiscriminate disposal of used fluorescent electric lamps causes mercury pollution in the environment. Why is. mercury used .in the manufacture of these lamps ?
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question_subject: 

Science

question_exam: 

IAS

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0,79,190,95,40,95,39

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{'mercury pollution': [2, 0, 1, 0], 'fluorescent lamps': [0, 0, 1, 0], 'mercury coating': [0, 0, 1, 0], 'fluorescent': [0, 0, 2, 0], 'electric lamps': [0, 0, 1, 1], 'mercury': [0, 0, 2, 2], 'emission': [0, 0, 4, 5], 'lamps': [0, 0, 1, 5], 'lamp': [0, 0, 1, 0], 'visible light': [0, 0, 6, 6], 'indiscriminate disposal': [0, 0, 0, 1]}