Chemical Engineering - Environmental Engineering

6. 

Maximum allowable concentration of CO2 in air for safe working is __________ ppm (parts per million).

A. 50
B. 1000
C. 2000
D. 5000

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

7. 

Tolerable limit of nitrogen oxides in air is __________ ppm.

A. 0.1
B. 1
C. 5
D. 25

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.

8. 

Iron & manganese present as pollutant in water can not be removed by

A. ion exchange process.
B. oxidation followed by settling & filtration.
C. lime soda process or manganese zeolite process.
D. chlorination.

Answer: Option D

Explanation:

No answer description available for this question. Let us discuss.

9. 

In water chemical treatment plant, use of chloramines ensures

A. disinfection.
B. taste & odour control.
C. weed control in reservoirs.
D. removal of permanent hardness.

Answer: Option A

Explanation:

No answer description available for this question. Let us discuss.

10. 

Which of the following is the common pollutant emitted from metallurgical smelters, thermal power plant and cement plants ?

A. NOx
B. Hg
C. SO2
D. F

Answer: Option C

Explanation:

No answer description available for this question. Let us discuss.