Q: 4 (IAS/2013)

Due to improper/indiscriminate disposal of old and used computers of their parts, which of the following are released into the environment as e-waste?
1. Beryllium
2. Cadmium
3. Chromium
4. Heptachlor
5. Mercury
6. Lead
7. Plutonium

Select the correct answer using the codes given below.
question_subject: 
Ecology
question_year: 
2013
question_exam: 
IAS
question_sub_subject: 
Ecology
question_topic: 
Ecology
stats: 
0,7888,3248,800,7888,592,1856