The condition that indicates a polluted environment is :
Show Hint
- BOD value of 5 ppm
- eutrophication
- 0.03% of \(\mathrm{CO_2}\) in the atmosphere
- pH of rain water to be 5.6
The Correct Option is B
Solution and Explanation
0.03% \(\mathrm{CO_2}\) is the normal atmospheric level.
Rain water has pH about 5.6 because of dissolved \(\mathrm{CO_2}\) (carbonic acid); acid rain has pH below 5.6.
Eutrophication is the excessive enrichment of a water body with nutrients (nitrates and phosphates), causing algal bloom and oxygen depletion; it is a sign of pollution.
Answer: (2) eutrophication
Top JEE Main Chemistry Questions
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- At equilibrium the concentrations of and in a sealed vessel at . What will be for the reaction
- Find out the major products from the following reactions
Cobalt chloride when dissolved in water forms pink colored complex $X$ which has octahedral geometry. This solution on treating with cone $HCl$ forms deep blue complex, $\underline{Y}$ which has a $\underline{Z}$ geometry $X, Y$ and $Z$, respectively, are
- The correct order of atomic radii is:
Top JEE Main Environmental Chemistry Questions
- Identify the incorrect pair from the following:
Photochemical smog found mainly in
- Formation of photochemical smog involves the following reaction in which $A , B$ and $C$ are respectively i $NO _2 \xrightarrow{ h\nu } A + B$ ii $B + O _2 \rightarrow C$ iii $A + C \rightarrow NO _2+ O _2$ Choose the correct answer from the options given below:
- A water sample has ppm level concentration of the following metals: $Fe = 0.2; Mn = 5.0; Cu = 3.0; Zn = 5.0.$ The metal that makes the water sample unsuitable drinking is
- Animal starch is the other name of
Top JEE Main Questions
- Two masses $m$ and $\frac{m}{2}$ are connected at the two ends of a massless rigid rod of length $l$. The rod is suspended by a thin wire of torsional constant $k$ at the centre of mass of the rod-mass system(see figure). Because of torsional constant $k$, the restoring torque is $\tau =k\theta$ for angular displacement $\theta$. If the rod is rota ted by $\theta_0$ and released, the tension in it when it passes through its mean position will be:
What will be the equilibrium constant of the given reaction carried out in a \(5 \,L\) vessel and having equilibrium amounts of \(A_2\) and \(A\) as \(0.5\) mole and \(2 \times 10^{-6}\) mole respectively?
The reaction : \(A_2 \rightleftharpoons 2A\)- The value of is
- The number of terms of an is even. The sum of the odd terms is and of the even terms is . The last term exceeds the first by . Then the number of terms in the series is ______.
A black body is at a temperature of 2880 K. The energy of radiation emitted by this body with wavelength between 499 nm and 500 nm is U1, between 999 nm and 1000 nm is U2 and between 1499 nm and 1500 nm is U3. The Wien's constant, b = 2.88×106 nm-K. Then,