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1
JEE Main 2023 (Online) 8th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which of these reactions is not a part of breakdown of ozone in stratosphere?

A
$$\mathrm{C{F_2}C{l_2}(g)\buildrel {uv} \over \longrightarrow \mathop C\limits^ \bullet l(g) + \mathop C\limits^ \bullet {F_2}Cl(g)}$$
B
$$\mathrm{C\mathop l\limits^ \bullet (g) + {O_3}(g)\buildrel {} \over \longrightarrow Cl\mathop O\limits^ \bullet (g) + {O_2}(g)}$$
C
$$\mathrm{2Cl\mathop O\limits^ \bullet \buildrel {} \over \longrightarrow Cl{O_2}(g) + C\mathop l\limits^ \bullet (g)}$$
D
$$\mathrm{Cl\mathop O\limits^ \bullet (g) + O(g)\buildrel {} \over \longrightarrow C\mathop l\limits^ \bullet (g) + {O_2}(g)}$$
2
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
3
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
4
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
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