Recent questions tagged principles-of-water-chemistry

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...

Which of the following options is/are TRUE about reverse osmosis process?Reverse osmosis is used as a pretreatment for microfiltration process.Ultrafiltration is used as ...

Which of the following options is/are TRUE about coagulation-flocculation process?Collision of colloidal particles due to their Brownian motion results in orthokinetic fl...

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...

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

​​​​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...

​Choose the correct option(s) for removing solids from water.chlorinationcoagulation-flocculation-sedimentation followed by slow sand filtrationchlorination followed by a...

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

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...

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 $\mathrm{pH}$ 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...

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...

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...

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...

An adult of $65 \mathrm{~kg}$ weight and life span of 65 years drinks water for 5 years, which is contaminated with toluene of concentration $0.15 \mathrm{mg} / \mathrm{L...

Which of the following causes $\text{'Type-I'}$ settling in a sedimentation tank? AgglomerationCompression Force of gravityCharge neutralization