This chapter is currently out of syllabus
1
JEE Main 2021 (Online) 24th February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The gas released during anaerobic degradation of vegetation may lead to :
A
Ozone hole
B
Corrosion of metals
C
Acid rain
D
Global warming and cancer
2
JEE Main 2020 (Online) 6th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The presence of soluble fluoride ion upto 1 ppm concentration in drinking water, is :
A
safe for teeth
B
harmful to skin
C
harmful for teeth
D
harmful to bones
3
JEE Main 2020 (Online) 5th September Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The condition that indicates a polluted environment is :
A
BOD value of 5 ppm
B
eutrophication
C
0.03% of CO2 in the atmosphere
D
pH of rain water to be 5.6
4
JEE Main 2020 (Online) 4th September Evening Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :
A
Global warming and photochemical smog
B
Photochemical smog and ozone layer depletion
C
Photochemical smog and global warming
D
Global warming and acid rain
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