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1
JEE Main 2023 (Online) 1st February Morning Shift
MCQ (Single Correct Answer)
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-1
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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.
2
JEE Main 2023 (Online) 31st January Morning Shift
MCQ (Single Correct Answer)
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Identify X, Y and Z in the following reaction. (Equation not balanced)

JEE Main 2023 (Online) 31st January Morning Shift Chemistry - Environmental Chemistry Question 19 English

A
$$\mathrm{X}=\mathrm{ClONO}_{2}, \mathrm{Y}=\mathrm{HOCl}, \mathrm{Z}=\mathrm{NO}_{2}$$
B
$$\mathrm{X}=\mathrm{ClNO}_{3}, \mathrm{Y}=\mathrm{Cl}_{2}, \mathrm{Z}=\mathrm{NO}_{2}$$
C
$$\mathrm{X}=\mathrm{ClONO}_{2}, \mathrm{Y}=\mathrm{HOCl}, \mathrm{Z}=\mathrm{HNO}_{3}$$
D
$$\mathrm{X}=\mathrm{ClNO}_{2}, \mathrm{Y}=\mathrm{HCl}, \mathrm{Z}=\mathrm{HNO}_{3}$$
3
JEE Main 2023 (Online) 30th January Evening Shift
MCQ (Single Correct Answer)
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The water quality of a pond was analyzed and its BOD was found to be 4. The pond has :
A
Very clean water
B
Highly polluted water
C
Water has high amount of fluoride compounds
D
Slightly polluted water
4
JEE Main 2023 (Online) 30th January Morning Shift
MCQ (Single Correct Answer)
+4
-1
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Formation of photochemical smog involves the following reaction in which $$\mathrm{A}, \mathrm{B}$$ and $$\mathrm{C}$$ are respectively.

$$ \begin{aligned} & \text { i. } \mathrm{NO}_{2} \stackrel{\mathrm{h} v}{\longrightarrow} \mathrm{A}+\mathrm{B} \\ & \text { ii. } \mathrm{B}+\mathrm{O}_{2} \rightarrow \mathrm{C} \\ & \text { iii. } \mathrm{A}+\mathrm{C} \rightarrow \mathrm{NO}_{2}+\mathrm{O}_{2} \end{aligned} $$

Choose the correct answer from the options given below :

A
$$\mathrm{NO}, \mathrm{O} ~\& ~\mathrm{O}_{3}$$
B
$$\mathrm{N}, \mathrm{O}_{2} ~\& ~\mathrm{O}_{3}$$
C
$$\mathrm{O}, \mathrm{N}_{2} \mathrm{O} ~\& ~\mathrm{NO}$$
D
$$\mathrm{O}, \mathrm{NO} ~\mathrm{\&} ~\mathrm{NO}_{3}^{-}$$
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