Environmental Chemistry · JEE Main previous year questions

2019 7 questions

1. Q852019 · 12 Apr 2019 · Shift 1

   The correct set of species responsible for the photochemical smog is :

   1. A.$\text{NO},{\text{NO}}_2,{\text{O}}_3$ and hydrocarbons
   2. B.${\text{N}}_2,{\text{NO}}_2$ and hydrocarbons
   3. C.${\text{CO}}_2,{\text{NO}}_2,{\text{SO}}_2$ and hydrocarbons
   4. D.${\text{N}}_2,{\text{O}}_2,{\text{O}}_3$ and hydrocarbons
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   Answer: A

2. Q852019 · 12 Apr 2019 · Shift 2

   The primary pollutant that leads to photochemical smog is :

   1. A.acrolein
   2. B.ozone
   3. C.sulphur dioxide
   4. D.nitrogen oxides
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   Answer: D

3. Q892019 · 12 Apr 2019 · Shift 2

   The ratio of number of atoms present in a simple cubic, body centered cubic and face centered cubic structure are, respectively :

   1. A.8 : 1 : 6
   2. B.4 : 2 : 1
   3. C.1 : 2 : 4
   4. D.4 : 2 : 3
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   Answer: C

4. Q902019 · 10 Apr 2019 · Shift 2

   Air pollution that occurs in sunlight is :

   1. A.oxidising smog
   2. B.reducing smog
   3. C.fog
   4. D.acid rain
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   Answer: A

5. Q872019 · 12 Jan 2019 · Shift 1

   The molecule that has minimum /no role in the formation of photochemical smog, is :

   1. A.$\mathrm{C}{\mathrm{H}}_2=\mathrm{O}$
   2. B.${\mathrm{O}}_3$
   3. C.${\mathrm{N}}_2$
   4. D.$\mathrm{NO}$
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   Answer: C

6. Q832019 · 12 Jan 2019 · Shift 2

   The compound that is NOT a common component of photochemical smog is :

   1. A.${\mathrm{O}}_3$
   2. B.${\mathrm{H}}_3\mathrm{C}-\mathrm{CO}-\mathrm{OON}{\mathrm{O}}_2$
   3. C.$\mathrm{C}{\mathrm{H}}_2=\mathrm{CHCHO}$
   4. D.$\mathrm{C}{\mathrm{F}}_2\mathrm{C}{\mathrm{l}}_2$
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   Answer: D

7. Q872019 · 11 Jan 2019 · Shift 2

   The correct match between Item I and Item II is : $$\begin{array}{llll}\text{Item I}& & \text{Item II}& \\ \text{(A)}& \text{Allosteric effect}& \text{(P)}& \text{Molecule binding to the active site of enzyme}\\ \text{(B)}& \text{Competitive inhibitor}& \text{(Q)}& \text{Molecule crucial for communication in the body}\\ \text{(C)}& \text{Receptor}& \text{(R)}& \text{Molecule binding to a site other than the active site of enzyme}\\ \text{(D)}& \text{Poison}& \text{(S)}& \text{Molecule binding to the enzyme covalently}\end{array}$$

   1. A.(A)$\to$(P); (B)$\to$(R); (C)$\to$(Q); (D)$\to$(S)
   2. B.(A)$\to$(P); (B)$\to$(R); (C)$\to$(S); (D)$\to$(Q)
   3. C.(A)$\to$(R); (B)$\to$(P); (C)$\to$(S); (D)$\to$(Q)
   4. D.(A)$\to$(R); (B)$\to$(P); (C)$\to$(Q); (D)$\to$(S)
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   Answer: D