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
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