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Threshold limit value (TLV) means maximum permissible/acceptable concentration. TLV of phosgene in air is about __________ ppm (parts per million). | |
A. | 0.002 [Wrong Answer] |
B. | 0.2 [Correct Answer] |
C. | 1.2 [Wrong Answer] |
D. | 4.8 [Wrong Answer] |