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Question
Which hazardous material is used as a flame retardant in electronic plastic casings?
इलेक्ट्रॉनिक प्लास्टिक केसिंग में फ्लेम रिटार्डेंट के तौर पर कौन सा खतरनाक पदार्थ इस्तेमाल किया जाता है?
A.
Sodium chloride
B.
Polychlorinated Biphenyls (PCBs)
C.
Calcium carbonate
D.
Potassium nitrate
Answer ( Option B)

Polychlorinated Biphenyls (PCBs)

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