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Threshold limit values of X, Y and Z pol...

Threshold limit values of X, Y and Z pollutants are 9 ppm, 10 ppm and 15 ppm. The correct answer is/are
(A) X is more toxic than Y
(B) X is less toxic than Y
(C) Z is less toxic than X and Y
(D) Y is more toxic than X and Z
The corre A answer is

A

A, B

B

B, C

C

A, C

D

A, D

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The correct Answer is:
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