This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 12th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

Match List I with List II

LIST I LIST II
A. Nitrogen oxides in air I. Eutrophication
B. Methane in air II. pH of rain water becomes 5.6
C. Carbon dioxide III. Global warming
D. Phosphate fertilisers in water IV. Acid rain

Choose the correct answer from the options given below :

A
A-II, B-III, C-I, D-IV
B
A-I, B-II, C-III, D-IV
C
A-IV, B-II, C-III, D-I
D
A-IV, B-III, C-II, D-I
2
JEE Main 2023 (Online) 11th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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Which of the following compounds is an example of Freon?

A
$$\mathrm{C}_{2} \mathrm{H}_{2} \mathrm{F}_{2}$$
B
$$\mathrm{C}_{2} \mathrm{HF}_{3}$$
C
$$\mathrm{C}_{2} \mathrm{F}_{4}$$
D
$$\mathrm{C}_{2} \mathrm{Cl}_{2} \mathrm{F}_{2}$$
3
JEE Main 2023 (Online) 11th April Morning Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
Change Language

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 :

A
Statement I is incorrect but Statement II is correct
B
Both the statements I and II are incorrect
C
Both the statements I and II are correct
D
Statement I is correct but Statement II is incorrect
4
JEE Main 2023 (Online) 10th April Evening Shift
MCQ (Single Correct Answer)
+4
-1
Out of Syllabus
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The delicate balance of $$\mathrm{CO}_{2}$$ and $$\mathrm{O}_{2}$$ is NOT disturbed by :

A
Burning of Coal
B
Burning of petroleum
C
Respiration
D
Deforestation
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