Environmental Chemistry

Among the gases (a) – (e), the gases that cause greenhouse effect are : (a) CO₂ (b) H₂O (c) CFCs (d) O₂ (e) O₃

The processes of calcination and roasting in metallurgical industries, respectively, can Iead to :

A water sample has ppm level concentration of following anions F⁻ = 10; $SO_4^{2-}$ = 100; $NO_3^-$ = 50 The anion/anions that make/makes the water sample unsuitable for drinking is/are :

Biochemical Oxygen Demand (BOD) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?

Correct statement about smog is :

The gas 'A' is having very low reactivity reaches to stratosphere. It is non-toxic and non-flammable but dissociated by UV-radiations in stratosphere. The intermediates formed initially from the gas 'A' are :

In stratosphere most of the ozone formation is assisted by :

Given below are two statements: Statement I : The non bio-degradable fly ash and slag from steel industry can be used by cement industry. Statement II : The fuel obtained from plastic waste is lead free. In the light of the above statements, choose the most appropriate answer from the options given below :

The deposition of X and Y on ground surfaces is referred as wet and dry depositions, respectively. X and Y are :

The statement that is not true about ozone is :

Given below are two statements : Statement I : Chlorofluoro breakdown by radiation in the visible energy region and release chlorine gas in the atmosphere which then reacts with stratospheric ozone. Statement II : Atmospheric ozone reacts with nitric oxide to give nitrogen and oxygen gases, which add to the atmosphere. For the above statements choose the correct answer from the options given below :

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Photochemical smog causes cracking of rubber. Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing. Choose the most appropriate answer from the options given below :

The smog is essentially caused by the presence of :

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

The higher concentration of which gas in air can cause stiffness of flower buds?

Taj Mahal is being slowly disfigured and discoloured. This is primarily due to :

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

Excessive release of CO₂ into the atomosphere results in :