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Civil Engineering
Pollution (Air and Noise)
Concentration of krypton in clean air is ...
Que.
Concentration of krypton in clean air is :
A.
1.1 ppm
B.
0.11 ppm
C.
0.5 ppm
D.
0.05 ppm
Right Answer is :
✓ A. 1.1 ppm
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