JEE Main 2023 (Online) 11th April Morning Shift | Environmental Chemistry Question 6 | Chemistry

This chapter is currently out of syllabus

JEE Main 2023 (Online) 11th April Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Given below are two statements:

Statement I : If BOD is 4 ppm and dissolved oxygen is 8 ppm, then it is a good quality water.

Statement II : If the concentration of zinc and nitrate salts are $$5 ~\mathrm{ppm}$$ each, then it can be a good quality water.

In the light of the above statements, choose the most appropriate answer from the options given below :

Statement I is incorrect but Statement II is correct

Both the statements I and II are incorrect

Both the statements I and II are correct

Statement I is correct but Statement II is incorrect

JEE Main 2023 (Online) 10th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

The delicate balance of $$\mathrm{CO}_{2}$$ and $$\mathrm{O}_{2}$$ is NOT disturbed by :

Burning of Coal

Burning of petroleum

Respiration

Deforestation

JEE Main 2023 (Online) 10th April Morning Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Match List I with List II

Choose the correct answer from the options given below :

(A)-(III), (B)-(II), (C)-(I), (D)-(IV)

(A)-(III), (B)-(IV), (C)-(I), (D)-(II)

(A)-(IV), (B)-(I), (C)-(II), (D)-(III)

(A)-(II), (B)-(III), (C)-(IV), (D)-(I)

JEE Main 2023 (Online) 8th April Evening Shift

MCQ (Single Correct Answer)

-1

Out of Syllabus

Which of these reactions is not a part of breakdown of ozone in stratosphere?

$$\mathrm{C{F_2}C{l_2}(g)\buildrel {uv} \over \longrightarrow \mathop C\limits^ \bullet l(g) + \mathop C\limits^ \bullet {F_2}Cl(g)}$$

$$\mathrm{C\mathop l\limits^ \bullet (g) + {O_3}(g)\buildrel {} \over \longrightarrow Cl\mathop O\limits^ \bullet (g) + {O_2}(g)}$$

$$\mathrm{2Cl\mathop O\limits^ \bullet \buildrel {} \over \longrightarrow Cl{O_2}(g) + C\mathop l\limits^ \bullet (g)}$$

$$\mathrm{Cl\mathop O\limits^ \bullet (g) + O(g)\buildrel {} \over \longrightarrow C\mathop l\limits^ \bullet (g) + {O_2}(g)}$$

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