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

The water quality of a pond was analyzed and its BOD was found to be 4. The pond has :

Formation of photochemical smog involves the following reaction in which $$\mathrm{A},\mathrm{B}$$ and $$\mathrm{C}$$ are respectively. $$\begin{array}{rl}& \text{ i. }{\mathrm{NO}}_2\stackrel{\mathrm{h}v}{⟶}\mathrm{A}+\mathrm{B}\\ & \text{ ii. }\mathrm{B}+{\mathrm{O}}_2\to \mathrm{C}\\ & \text{ iii. }\mathrm{A}+\mathrm{C}\to {\mathrm{NO}}_2+{\mathrm{O}}_2\end{array}$$ Choose the correct answer from the options given below :

The concentration of dissolved Oxygen in water for growth of fish should be more than $$\underline{\mathrm{X}}$$ ppm and Biochemical Oxygen Demand in clean water should be less than $$\underline{\mathrm{Y}}$$ ppm. X and Y in ppm are, respectively.

Correct statement about smog is :

Some reactions of NO$${}_2$$ relevant to photochemical smog formation are Identify A, B, X and Y :

Correct statement is :

Which of the following is true about freons?

The possibility of photochemical smog formation will be minimum at :

Which of the following are the Green house gases? A. Water vapour B. Ozone C. I$${}_2$$ D. Molecular hydrogen Choose the most appropriate answer from the options given below :

The radical which mainly causes ozone depletion in the presence of UV radiations is :

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} 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 :

Which of the following compounds is an example of Freon?

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 :

The delicate balance of $${\mathrm{CO}}_2$$ and $${\mathrm{O}}_2$$ is NOT disturbed by :

Match List I with List II .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-baqh{text-align:center;vertical-align:top} .tg .tg-amwm{font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0lax{text-align:left;vertical-align:top} List I Industry List II Waste Generated (A) Steel plants (I) Gypsum (B) Thermal power plants (II) Fly ash (C) Fertilizer industries (III) Slag (D) Paper mills (IV) Bio-degradable wastes Choose the correct answer from the options given below :

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

Match List I with List II: .tg {border-collapse:collapse;border-spacing:0;} .tg td{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; overflow:hidden;padding:10px 5px;word-break:normal;} .tg th{border-color:black;border-style:solid;border-width:1px;font-family:Arial, sans-serif;font-size:14px; font-weight:normal;overflow:hidden;padding:10px 5px;word-break:normal;} .tg .tg-c3ow{border-color:inherit;text-align:center;vertical-align:top} .tg .tg-7btt{border-color:inherit;font-weight:bold;text-align:center;vertical-align:top} .tg .tg-0pky{border-color:inherit;text-align:left;vertical-align:top} LIST I (Species) LIST II (Maximum allowed concentration in ppm in drinking water) A. $${\mathrm{F}}^{-}$$ I. < 50 ppm B. $$\mathrm{S}{\mathrm{O}}_4^{2-}$$ II. < 5 ppm C. $$\mathrm{N}{\mathrm{O}}_3^{-}$$ III. < 2 ppm D. $$\mathrm{Zn}$$ IV. < 500 ppm Choose the correct answer from the options given below :

The possibility of photochemical smog formation is more at :

An organic compound $[\mathrm{A}]\left({\mathrm{C}}_4{\mathrm{H}}_{11}\mathrm{N}\right)$, shows optical activity and gives ${\mathrm{N}}_2$ gas on treatment with ${\mathrm{HNO}}_2$. The compound $[\mathrm{A}]$ reacts with ${\mathrm{PhSO}}_2\mathrm{Cl}$ producing a compound which is soluble in $\mathrm{KOH}$. The structure of $\mathrm{A}$ is :