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Threshold limit value (TLV) i.e., the maximum permissible safe limit of phosgene gas which Hitler used to use to kill his enemies in 'gas chamber' is about __________ ppm. | |
A. | <1 [Correct Answer] |
B. | 10-100 [Wrong Answer] |
C. | 100-200 [Wrong Answer] |
D. | 100-1000 [Wrong Answer] |