Entry Test MCQ :: Environmental Chemistry

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21.

The main pollutant of leather tanneries in the waste water is

A.	chromium III	B.	chromium IV
C.	chromium V	D.	chromium VI

22.

A single chlorine free radical can destroy how many ozone molecules?

A.	10	B.	100
C.	10000	D.	100000

23.

Which substance can be used for disinfecting water?

A.	KMnO4	B.	Alums
C.	Ozone	D.	All

24.

Chlorination of water may be harmful if the water contains

A.	Ammonia	B.	Dissolved oxygen
C.	Carbon dixide	D.	All

25.

Which one of the following makes the bulk of hydrospheres content?

A.	oceans	B.	glaciers & icecaps
C.	fresh water lakes and ponds	D.	All have equal distribution

26.

Which of the following is used as water disinfectant to avoid the formation of toxic compounds

A.	Cl2	B.	O3
C.	ClO2	D.	both b & c

27.

The percentage of suspended solid waste in raw water is removed by coagulation is

A.	60	B.	70
C.	80	D.	90

28.

Ozone hole is substantial depletion of ozone in every year during

A.	Aug - Nov	B.	Sep - Nov
C.	Nov - Dec	D.	Dec - Jan

29.

The main product of bacterial action is

A.	Nox	B.	NO2
C.	N2O3	D.	NO

30.

Pollutants have adverse effect over

A.	Biosphere	B.	Ecosystem
C.	Both a & b	D.	Hydrosphere