Recent questions in Environmental Chemistry

The general atmospheric composition of gases in the decreasing order is $\_\_\_\_$.$\mathrm{N}_{2}>\mathrm{O}_{2}>\mathrm{CO}>\mathrm{CO}_{2}>\mathrm{NH}_{3}$$\mathrm{N}_...

Which of the following chemical reactions is/are related to smog formation in the troposphere?$\mathrm{CFCl}_{3}+h v \rightarrow \mathrm{CFCl}_{2}+\mathrm{Cl} \cdot$$\mat...

Which of the following options is/are CORRECTLY listing the species included in Total Kjeldahl Nitrogen (TKN) estimation of an aqueous sample?Ammoniacal - $\text{N}$Nitri...

The analysis of a water sample is shown in the table. The hardness of the water sample is $\_\_\_\_$ $\mathrm{mg} / \mathrm{L}$ as $\mathrm{CaCO}_{3}$.Atomic weight $(\ma...

The mixing ratio of $\mathrm{CO}_{2}$ at a pressure of $1$ $\mathrm{atm}$ and at $300$ $\mathrm{K}$ is reported as $340$ $\mathrm{ppmv}$.Considering ideal gas conditions,...

The following two reactions describe the chemistry of $\text{S(IV)}$ in an aquatic system.Under ideal conditions, the equilibrium constants for reactions $\text{(i)}$ and...

The calibration graph between absorbance and the concentration of chromate $\left(\mathrm{CrO}_{4}{ }^{2-}\right)$ in a water sample is shown in the figure.For an absorba...

​​​​Choose the redox reaction from the following$\mathrm{H}_{2} \mathrm{CO}_{3} \leftrightarrow \mathrm{H}^{+}+\mathrm{HCO}_{3}^{-}$$\mathrm{Hg}^{2+}+2 \mathrm{OH}^{-} \l...

​​​​Consider the following statements related to nitrification process:Electron acceptor type vary depending on whether nitrosomonas or nitrobacter is involved.Predominan...

​​​​Choose the correct option(s) from the following regarding cumulative toxicityBioaccumulation is the process by which a living organism keeps on accumulating pollutant...

​​​​A researcher added certain amount of $\mathrm{HgCl}_{2}$ to water at $\mathrm{pH} 10$. He calculated the expected concentration of mercury in the water. He asked his ...

​​​​​Correctly label the speciation diagram below:$\mathrm{I}=\mathrm{PO}_{4}{ }^{3-}, \mathrm{II}=\mathrm{HPO}_{4}{ }^{2-}, \mathrm{III}=\mathrm{H}_{2} \mathrm{PO}_{4}{ ...

​​​​​Choose the correct option(s) from the following regarding the solubility in waterWater is a polar molecule because of the asymmetric distribution of charge between t...

A boiler burns coal at a rate of $1 \mathrm{~kg} / \mathrm{s}$. If the coal has $3 \%$ sulfur content, assuming that there is no sulfur in ash, $\mathrm{SO}_{2}$ emitted ...

Water from a hand pump located near a landfill has $1 \mathrm{mg} / \mathrm{L}$ arsenic (oral carcinogenic potency factor $=1.75(\mathrm{~kg-day}) / \mathrm{mg})$. A pers...

Hardness in water is NOT caused by$\mathrm{Ca}^{2+}$$\mathrm{Si}^{2+}$$\mathrm{Mg}^{2+}$$\mathrm{CO}_{3}^{2-}$

Crown corrosion of reinforced cement concrete sewer is caused by ___________.sulfur oxidizing bacteriairon oxidizing bacteriadenitrifying bacteriafermentative bacteria

Which one of the following conversions belongs to nonsymbiotic nitrogen fixation?Atmospheric nitrogen to ammonia by Rhizobium bacteria in nodules attached to roots of leg...

The environmental temperature increases by $6^{\circ} \mathrm{C} / \mathrm{km}$ with height at a particular location. The stability condition of the atmosphere at the loc...

A saturated $\mathrm{CaCO}_{3}$ stock solution is existing at $25^{\circ} \mathrm{C}$. In one experiment $\text{(i)}$ $25 \mathrm{~g}$ $\mathrm{Na}_{2} \mathrm{CO}_{3}$ i...