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1
JEE Main 2023 (Online) 8th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Match List I with List II:

LIST I
(Species)		 LIST II
(Maximum allowed concentration in ppm in drinking water)
A. $$\mathrm{F^-}$$ I. < 50 ppm
B. $$\mathrm{SO_4^{2-}}$$ II. < 5 ppm
C. $$\mathrm{NO_3^-}$$ III. < 2 ppm
D. $$\mathrm{Zn}$$ IV. < 500 ppm

Choose the correct answer from the options given below :

A
A-IV, B-III, C-II, D-I
B
A-I, B-II, C-III, D-IV
C
A-II, B-I, C-III, D-IV
D
A-III, B-IV C-I, D-II
2
JEE Main 2023 (Online) 6th April Morning Shift
MCQ (Single Correct Answer)
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-1
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The possibility of photochemical smog formation is more at :

A
Industrial areas
B
Himalayan villages in winter
C
The places with healthy vegetation
D
Marshy lands
3
JEE Main 2023 (Online) 1st February Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The industrial activity held least responsible for global warming is :

A
manufacturing of cement
B
Electricity generation in thermal power plants
C
steel manufacturing
D
Industrial production of urea
4
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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How can photochemical smog be controlled?

A
By using catalytic convertors in the automobiles/industry.
B
By complete combustion of fuel.
C
By using tall chimneys.
D
By using catalyst.
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