Recent questions in Environmental Chemistry

The characteristics of a water sample are as follows: $\mathrm{Na}^{+}=92 \mathrm{mg} / \mathrm{L}$, $\mathrm{K}^{+}=19.5 \mathrm{mg} / \mathrm{L}, \mathrm{Ca}^{2+}=40 \m...

In the context of water quality, which of the following is/are correct for the most probable number $\text{(MPN)}$ of a water sample?The estimated organisms are gram nega...

The molar concentrations $(M$, i.e. $m o l / L)$ of some ionic species in a water sample were estimated as follows:$\mathrm{Na}^{+}=0.25{\mathrm{M} ; \mathrm{Ca}^{2+}}^{2...

Excess amount of solid calcium sulphate $\left(\mathrm{CaSO}_4\right)$ was added to a pure water sample $(\mathrm{pH}=7)$ so that some solids remain undissolved at the eq...

Specific conductance is used in water analysis to indirectly estimate dissolved solids. The measurements used in the method accounts forCations onlyAll ionsAnions onlyUn-...

Carbon dioxide is used in recarbonation process. A solution has $1 \mathrm{~mole} / \mathrm{L}$ supersaturated calcium carbonate. Estimated amount of carbon dioxide (in g...

If G represents Gibbs free energy, select the correct statement(s)If $\Delta \mathrm{G}=0$, reaction will proceed only in one directionIf $\Delta \mathrm{G}=0$, reaction ...

For effluents generated by a molasses based distillery and wood based pulp and paper industry, which of the following statement(s) is/are NOT correct?Both the effluents h...

During night, in troposphere, which of the following is/are NOT correct$\quad \mathrm{NO}_{2}+\mathrm{ho} \rightarrow \mathrm{NO}+\mathrm{O}$Most of the $\mathrm{NOx}$ (i...

Carbon cycle, nitrogen cycle and phosphorus cycle play important role in the ecosystems. Which of the following statement(s) is/are NOT correct about the phosphorus cycle...

The Henry's law constant of $\mathrm{CO}_{2}$ is $3.4 \times 10^{-2} \mathrm{M}$ per atm in neutral water at $25^{\circ} \mathrm{C}$. The dissolved $\mathrm{CO}_{2}$ (i.e...

A solution has $0.001$ mole/L zinc ions having $\mathrm{pH}$ of $6$. Solubility product of zinc hydroxide is given as $8 \times 10^{-18}(\mathrm{~mole} / \mathrm{L})^{3}$...