This chapter is currently out of syllabus
1
JEE Main 2023 (Online) 31st January Morning Shift
+4
-1
Out of Syllabus

Identify X, Y and Z in the following reaction. (Equation not balanced)

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
$$\mathrm{X}=\mathrm{ClNO}_{2}, \mathrm{Y}=\mathrm{HCl}, \mathrm{Z}=\mathrm{HNO}_{3}$$
2
JEE Main 2023 (Online) 30th January Evening Shift
+4
-1
Out of Syllabus
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
3
JEE Main 2023 (Online) 30th January Morning Shift
+4
-1
Out of Syllabus

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
$$\mathrm{O}, \mathrm{NO} ~\mathrm{\&} ~\mathrm{NO}_{3}^{-}$$
4
JEE Main 2023 (Online) 29th January Evening Shift
+4
-1
Out of Syllabus

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
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