Environmental Chemistry

Dinitrogen is a robust compound, but reacts at high altitudes to form oxides. The oxide of nitrogen that can damage plant leaves and retard photosynthesis is

Which of the following is not a component of photochemical smog?

The gas released during anaerobic degradation of vegetation may lead to :

A water sample has ppm level concentration of following anions

$\ce{F-}=10$ ; $\ce{SO4^2-}=100$ ; $\ce{NO3-}=50$

The anion/anions that make/makes the water sample unsuitable for drinking is/are :

Identify the pollutant gases largely responsible for the discoloured and lustreless nature of marble of the Taj Mahal.

Which of the following is a set of green house gases ?

The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :

The reaction of ozone with oxygen atoms in the presence of chlorine atoms can occur by a two step process shown below :

$\ce{O3(g) + Cl^.(g) -> O2(g) + ClO^.(g)}$ ...... (i) $k_i=5.2\times10^9$ L mol$^{-1}$ s$^{-1}$

$\ce{ClO^.(g) + O^.(g) -> O2(g) + Cl^.(g)}$ ...... (ii) $k_{ii}=2.6\times10^{10}$ L mol$^{-1}$ s$^{-1}$

The closest rate constant for the overall reaction $\ce{O3(g) + O^.(g) -> 2O2(g)}$ is :

BOD stands for :

Which one of the following substances used in dry cleaning is a better strategy to control environmental pollution ?

Photochemical smog consists of excessive amount of X, in addition to aldehydes, ketones, peroxy acetyl nitrile (PAN), and so forth. X is :

Addition of phosphate fertilisers to water bodies causes :

Which of the following statements about the depletion of ozone layer is correct ?

Global warming is due to increase of :