23 JEE Main 2019 Environmental Chemistry previous-year questions with verified answers and step-by-step solutions.
These are the JEE Main 2019 previous-year questions from the Environmental Chemistry chapter of Chemistry. Each links to a full solution with a verified answer key. To see the whole chapter across all years, visit the Environmental Chemistry chapter hub.
Water filled in two glasses A and B gave BOD values of 10 and 20 , respectively. The correct statement regarding them is
The pH of rain water is approximately:
Assertion: Ozone is destroyed by C F C s in the upper stratosphere. Reason: Ozone holes increase the amount of U V radi…
The higher concentration of which gas in air can cause stiffnes of flower buds?
The primary pollutant that leads to photochemical smog is:
Water samples with B O D values of 4 ppm and 18 ppm, respectively, are:
The noble gas that does not occur in the atmosphere is;
A water sample has ppm level concentration of the following metals: Fe = 0 .2 ;   Mn = 5 .0 ;   Cu = 3 .0 ; &…
The reaction that is not involved in the ozone layer depletion mechanism in the stratosphere is
The concentration of dissolved oxygen (DO) in cold water can go upto
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