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
(B) 10-100
(C) 100-200
(D) 100-1000

1 Answer

Answer :

(A) < 1

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