Environmental Chemistry

Some gases are responsible for heating of atmosphere (green house effect). Identify from the following the gaseous species which does not cause it.

The eutrophication of water body results in :

Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R.

Assertion A: Polluted water may have a value of BOD of the order of 17 ppm.

Reason R: BOD is a measure of oxygen required to oxidise both the bio-degradable and non-biodegradable organic material in water.

In the light of the above statements, choose the most appropriate answer from the options given below.

Polar stratospheric clouds facilitate the formation of :

The measured BOD values for four different water samples (A-D) are as follows: A = 3 ppm; B = 18 ppm; C = 21 ppm; D = 4 ppm. The water samples which can be called as highly polluted with organic wastes, are

Given below are two Statements :

Statement I : Classical smog occurs in cool humid climate. It is a reducing mixture of smoke, fog and sulphur dioxide.

Statement II : Photochemical smog has components, ozone, nitric oxide, acrolein, formaldehyde, PAN etc.

In the light of the above statements, choose the most appropriate answer from the options given below.

On the surface of polar stratospheric clouds, hydrolysis of chlorine nitrate gives A and B while its reaction with HCl produces B and C. A, B and C are, respectively

Which amongst the following is not a pesticide ?

Correct statement about photo-chemical smog is :

The acid that is believed to be mainly responsible for the damage of Taj Mahal is

Sulphur dioxide is one of the components of polluted air. $\mathrm{SO_2}$ is also a major contributor to acid rain. The correct and complete reaction to represent acid rain caused by $\mathrm{SO_2}$ is

Which one of the following chemicals has not been used for the dry cleaning of clothes ?

The photochemical smog does not generally contain :

Match List I with List II.

Choose the correct answer from the options given below:

$$\mathrm{\dot Cl+CH_4\rightarrow A+B}$$

A and B in the above atmospheric reaction step are :

Match List I with List II.

Choose the correct answer from the options given below :

Match List I with List II.

Choose the correct answer from the options given below:

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 :

Given below are two statements :

Statement I : In polluted water values of both dissolved oxygen and BOD are very low.

Statement II : Eutrophication results in decrease in the amount of dissolved oxygen.

In the light of the above statements, choose the most appropriate answer from the options given below :

Which among the following pairs has only herbicides ?