Environmental Chemistry · JEE Main previous year questions

2023 7 questions

1. Q772023 · 12 Apr 2023 · Shift 1

   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 :

   1. A.A-II, B-III, C-I, D-IV
   2. B.A-I, B-II, C-III, D-IV
   3. C.A-IV, B-II, C-III, D-I
   4. D.A-IV, B-III, C-II, D-I
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   Answer: D

2. Q852023 · 10 Apr 2023 · Shift 1· Numerical answer

   The number of incorrect statement/s about the black body from the following is __________ (A) Emit or absorb energy in the form of electromagnetic radiation. (B) Frequency distribution of the emitted radiation depends on temperature. (C) At a given temperature, intensity vs frequency curve passes through a maximum value. (D) The maximum of the intensity vs frequency curve is at a higher frequency at higher temperature compared to that at lower temperature.

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   Answer: 0

3. Q772023 · 8 Apr 2023 · Shift 2

   The statement/s which are true about antagonists from the following is/are: A. They bind to the receptor site. B. Get transferred inside the cell for their action. C. Inhibit the natural communication of the body. D. Mimic the natural messenger. Choose the correct answer from the options given below:

   1. A.B only
   2. B.A and B
   3. C.A and C
   4. D.A, C and D
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   Answer: C

4. Q722023 · 1 Feb 2023 · Shift 1

   How can photochemical smog be controlled?

   1. A.By using catalytic convertors in the automobiles/industry.
   2. B.By complete combustion of fuel.
   3. C.By using tall chimneys.
   4. D.By using catalyst.
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   Answer: A

5. Q752023 · 30 Jan 2023 · Shift 1

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

   1. A.$\mathrm{NO}$, $\mathrm{O}$ & ${\mathrm{O}}_3$
   2. B.$\mathrm{N}$, ${\mathrm{O}}_2$ & ${\mathrm{O}}_3$
   3. C.$\mathrm{O}$, ${\mathrm{N}}_2\mathrm{O}$ & $\mathrm{NO}$
   4. D.$\mathrm{O}$, $\mathrm{NO}$ & ${\mathrm{NO}}_3^{-}$
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   Answer: A

6. Q742023 · 29 Jan 2023 · Shift 1

   Correct statement about smog is :

   1. A.$\mathrm{N}{\mathrm{O}}_2$ is present in classical smog
   2. B.Both $\mathrm{N}{\mathrm{O}}_2$ and $\mathrm{S}{\mathrm{O}}_2$ are present in classical smog
   3. C.Photochemical smog has high concentration of oxidizing agents
   4. D.Classical smog also has high concentration of oxidizing agents
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   Answer: C

7. Q772023 · 25 Jan 2023 · Shift 1

   Some reactions of $\mathrm{N}{\mathrm{O}}_2$ relevant to photochemical smog formation are $$\mathrm{N}{\mathrm{O}}_2\stackrel{\text{sunlight}}{\to }\mathrm{X}+\mathrm{Y},\mathrm{X}\stackrel{\mathrm{A}}{\to }\mathrm{B}$$ Identify A, B, X and Y :

   1. A.$\mathrm{X}=[\mathrm{O}],\mathrm{Y}=\mathrm{NO},\mathrm{A}={\mathrm{O}}_2,\mathrm{B}={\mathrm{O}}_3$
   2. B.$\mathrm{X}={\mathrm{N}}_2\mathrm{O},\mathrm{Y}=[\mathrm{O}],\mathrm{A}={\mathrm{O}}_3,\mathrm{B}=\mathrm{NO}$
   3. C.$\mathrm{X}=\frac{1}{2}{\mathrm{O}}_2,\mathrm{Y}=\mathrm{N}{\mathrm{O}}_2,\mathrm{A}={\mathrm{O}}_3,\mathrm{B}={\mathrm{O}}_2$
   4. D.$\mathrm{X}=\mathrm{NO},\mathrm{Y}=[\mathrm{O}],\mathrm{A}={\mathrm{O}}_2,\mathrm{B}={\mathrm{N}}_2{\mathrm{O}}_3$
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   Answer: A