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1
JEE Main 2023 (Online) 29th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The concentration of dissolved Oxygen in water for growth of fish should be more than $$\mathrm{\underline X }$$ ppm and Biochemical Oxygen Demand in clean water should be less than $$\mathrm{\underline Y }$$ ppm. X and Y in ppm are, respectively.

A
$$\mathrm{X}$$ $$\mathrm{Y}$$
4 15
B
$$\mathrm{X}$$ $$\mathrm{Y}$$
4 8
C
$$\mathrm{X}$$ $$\mathrm{Y}$$
6 12
D
$$\mathrm{X}$$ $$\mathrm{Y}$$
6 5
2
JEE Main 2023 (Online) 29th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Correct statement about smog is :

A
NO$$_2$$ is present in classical smog
B
Both NO$$_2$$ and SO$$_2$$ are present in classical smog
C
Photochemical smog has high concentration of oxidizing agents
D
Classical smog also has high concentration of oxidizing agents
3
JEE Main 2023 (Online) 25th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Some reactions of NO$$_2$$ relevant to photochemical smog formation are

JEE Main 2023 (Online) 25th January Morning Shift Chemistry - Environmental Chemistry Question 14 English

Identify A, B, X and Y :

A
$$\mathrm{X = [O],Y = NO,A = {O_2},B = {O_3}}$$
B
$$\mathrm{X = {N_2}O,Y = [O],A = {O_3},B = NO}$$
C
$$\mathrm{X = {1 \over 2}{O_2},Y = N{O_2},A = {O_3},B = {O_2}}$$
D
$$\mathrm{X = NO,Y = [O],A = {O_2},B = {N_2}{O_3}}$$
4
JEE Main 2023 (Online) 24th January Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Correct statement is :

A
An average human being consumes more food than air
B
An average human being consumes 100 times more air than food
C
An average human being consumes nearly 15 times more air than food
D
An average human being consumes equal amount of food and air
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