Maximum permissible concentration (i.e. TLV) of DDT in public water supply system is __________ micro gram (μ g)/litre. (A) 22 (B) 42 (C) 332 (D) 1050

Maximum permissible concentration (i.e. TLV) of DDT in public water
supply system is __________ micro gram (μ g)/litre.
(A) 22
(B) 42
(C) 332
(D) 1050
by

1 Answer

Answer :

(B) 42
by

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