Recent questions in Environmental Chemistry

The $\mathrm{pH}$ of a solution containing $0.1 \mathrm{M}$ of acetic acid and $0.05 \mathrm{M}$ of sodium acetate is __________ $\text{(rounded off to $2$ decimal places...

The ionic strength of a solution containing $0.01 \mathrm{M}$ of $\mathrm{CaCl}_{2}$ and $0.001 \mathrm{M}$ of $\mathrm{Na}_{2} \mathrm{SO}_{4}$ is _________ $\mathrm{M}$...

The concentration of Ozone corresponding to a mixing ratio of $120 \mathrm{ppbv}$ at pressure of $1$ atmosphere and temperature of $25^{\circ} \mathrm{C}$ is ________ $\m...

An industry discharges $2$ million liters per day $\text{(MLD)}$ of wastewater with a temperature of $45^{\circ} \mathrm{C}$ and a $\mathrm{pH}$ of $2$, whereas the neigh...

A person consumes $2.5$ liters of water per day. The water quality test indicated that the supplied water has a $\mathrm{Pb}$ concentration of $0.6 \mathrm{mg} / \mathrm{...

Two hypothetical organic waste streams A and B are mixed prior to the composting process. Waste-A has $2.16 \%$ of $\mathrm{C}$ and $1.20 \%$ of N. Waste-B has $19.10 \%$...

Initially a bottle contained $400 \mathrm{~g}$ of ethanol. Half of ethanol was used by a student for preparing the stock solution in an environmental chemistry laboratory...

For testing alkalinity for a water sample, first phenolphthalein indicator is added. The water remains colorless. However, when a few drops of methyl orange is added to t...

Match the followingJ) Dalton's lawi) DiffusionK) Fick's lawii) Pressure exerted by a mixture of gasesL) Henry's lawiii) Gravitational settlingM) Stoke's lawiv) Gas-liquid...

Read the following statementsI. According to the Liebig's law of minimum, the growth is regulated by the limited factors i.e., resources in scarcity and not by the resour...

Read the following statementsTrivalent chromium has relatively low aqueous solubility, and low mobility in the soil environment. By contrast, hexavalent chromium has a hi...

The solubility of gas A is $16 \mathrm{mg} / \mathrm{L}$ in water and its vapor pressure is $0.042 \mathrm{~atm}$. at $25^{\circ} \mathrm{C}$. In a closed system, the gas...

In a $30 \mathrm{~m}^{3}$ room, a stove in operation consumes wood at the rate of $0.25 \mathrm{~kg} / \mathrm{h}$. The inflow and outflow rate of air in the room is the ...

The table below shows the carbon content of four samples of powdered coal. If these four samples are mixed completely, what would be the resultant carbon percentage of th...

Chlorine is most effective as a water disinfectant at a $\text{pH}$ of _____________.$6$ $8$$10$$12$

The oxidation states of ' $\mathrm{N}$ ' in $\mathrm{NH}_{4}^{+}, \mathrm{NO}_{2}^{-}$, and $\mathrm{NO}$ are ________ respectively.$+2,-3$, and +3$-3,+3$, and +2$-3,+3$,...

What is the $\text{pH}$ of a water sample having $\mathrm{H}^{+}$ concentration of $10$ $\mathrm{mg} / \mathrm{L}$?The atomic weight of $\mathrm{H}$ is $1 \mathrm{~g} / ...

Which of the following is/are both greenhouse gas(es) and ozone depleting substance(s)?$\text{CFC-11}$$\mathrm{CO}_{2}$$\text{HCFC-22}$$\mathrm{N}_{2} \mathrm{O}$

A wind rose is a representation of meteorological conditions. Which of the following is/are included in this representation?Mixing heightWind speedWind directionPercentag...

A $200 \mathrm{~mL}$ sample of water has an initial $\mathrm{pH}=9$. In order to determine alkalinity, the sample was titrated using $0.02 \mathrm{~N} \mathrm{H}_2 \mathr...