Correct statement about smog is
Show Hint
To differentiate between classical and photochemical smog:
• Classical smog occurs in cool, humid conditions and is reducing in nature.
• Photochemical smog occurs in sunny conditions and contains strong oxidizing agents like ozone.
NO2 is present in classical smog
- Classical smog also has high concentration of oxidizing agents
- Photochemical smog has high concentration of oxidizing agents
Both NO2 and SO2 are present in classical smog
The Correct Option is C
Solution and Explanation
1. Classical Smog:
Also known as "reducing smog."
It is caused by high concentrations of \(\text{SO}_2\) and particulate matter under cool, humid conditions.
Classical smog does not contain oxidizing agents like \(\text{NO}_2\).
2. Photochemical Smog:
Formed in warm, sunny conditions.
It is caused by the reaction of \(\text{NO}_2\) and volatile organic compounds (VOCs) under sunlight, forming ozone and other oxidizing agents.
This type of smog has a high concentration of oxidizing agents like \(\text{O}_3\) and peroxyacetyl nitrate (PAN).
Final Answer: (3) Photochemical smog has a high concentration of oxidizing agents.
Top Questions on Environmental Chemistry
- In drinking water, if the maximum prescribed concentration of copper is x mg dm⁻³, the maximum prescribed concentration of zinc will be
- TS EAMCET - 2025
- Chemistry
- Environmental Chemistry
- Which of the following is dominantly responsible for buffering capacity of natural water?
- CUET (PG) - 2025
- Atmospheric Science
- Environmental Chemistry
- Minamata disease is caused by .......... poisoning.
- CUET (PG) - 2025
- Chemistry
- Environmental Chemistry
- Which one of the following are the commonly used oxidants in COD (Chemical Oxygen Demand) assays?
- CUET (UG) - 2025
- Environmental Science
- Environmental Chemistry
- The octet rule is not valid for which one of the following molecules?
- LPUNEST - 2025
- Chemistry
- Environmental Chemistry
Questions Asked in JEE Main exam
- Let $\vec{a}=2\hat{i}-\hat{j}-\hat{k}$, $\vec{b}=\hat{i}+3\hat{j}-\hat{k}$ and $\vec{c}=2\hat{i}+\hat{j}+3\hat{k}$. Let $\vec{v}$ be the vector in the plane of $\vec{a}$ and $\vec{b}$, such that the length of its projection on the vector $\vec{c}$ is $\dfrac{1}{\sqrt{14}}$. Then $|\vec{v}|$ is equal to
- JEE Main - 2026
- Vector Algebra
A substance 'X' (1.5 g) dissolved in 150 g of a solvent 'Y' (molar mass = 300 g mol$^{-1}$) led to an elevation of the boiling point by 0.5 K. The relative lowering in the vapour pressure of the solvent 'Y' is $____________ \(\times 10^{-2}\). (nearest integer)
[Given : $K_{b}$ of the solvent = 5.0 K kg mol$^{-1}$]
Assume the solution to be dilute and no association or dissociation of X takes place in solution.- JEE Main - 2026
- Solutions
- The wavelength of photon 'A' is 400 nm. The frequency of photon 'B' is \(10^{16}\,\text{s}^{-1}\). The wave number of photon 'C' is \(10^{5}\,\text{cm}^{-1}\). The correct order of energy of these photons is:
- JEE Main - 2026
- General Chemistry
- Given below are two statements: Statement I: The increasing order of boiling point of hydrogen halides is HCl<HBr<HI<HF. Statement II: The increasing order of melting point of hydrogen halides is HCl<HBr<HF<HI. In the light of the above statements, choose the correct answer from the options given below:
- JEE Main - 2026
- General Chemistry
Inductance of a coil with \(10^4\) turns is \(10\,\text{mH}\) and it is connected to a DC source of \(10\,\text{V}\) with internal resistance \(10\,\Omega\). The energy density in the inductor when the current reaches \( \left(\frac{1}{e}\right) \) of its maximum value is \[ \alpha \pi \times \frac{1}{e^2}\ \text{J m}^{-3}. \] The value of \( \alpha \) is _________.
\[ (\mu_0 = 4\pi \times 10^{-7}\ \text{TmA}^{-1}) \]- JEE Main - 2026
- Ray optics and optical instruments