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1
JEE Main 2017 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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A water sample has ppm level concentration of following anions
F- = 10; $$SO_4^{2-}$$ = 100; $$NO_3^-$$ = 50
The anion/anions that make/makes the water sample unsuitable for drinking is/are :
A
both $$SO_4^{2-}$$ and $$NO_3^-$$
B
only F-
C
only $$SO_4^{2-}$$
D
only $$NO_3^-$$
2
JEE Main 2016 (Online) 10th April Morning Slot
MCQ (Single Correct Answer)
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-1
Out of Syllabus
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Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution?
A
Tetrachloroethylene
B
Carbon dioxide
C
Sulphur dioxide
D
Nitrogen dioxide
3
JEE Main 2016 (Online) 9th April Morning Slot
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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BOD stands for :
A
Biological Oxygen Demand
B
Bacterial Oxidation Demand
C
Biochemical Oxygen Demand
D
Biochemical Oxidation Demand
4
JEE Main 2016 (Offline)
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language
The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :
A
Lead
B
Nitrate
C
Iron
D
Fluoride
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