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Copper can be extracted by hydrometallurgy but not zinc. Explain.
Solution Copper can be extracted by hydrometallurgy but not zinc, this is because $E_{Z n^{2}+Z n}^{o}=-0.76 \mathrm{~V}$ lower than that of $E_{\mathrm{Cu}^{2+} / C i}^{o}=-0.34 \mathrm{~V}$ Hence,...
Is it true that under certain conditions, Mg can reduce 
Solution Yes, below $1350^{\circ} \mathrm{C}, \mathrm{Mg}$ can reduce $\mathrm{Al}_{2} \mathrm{O}_{3}$ and above $1350^{\circ} \mathrm{C}, \mathrm{Al}$ can reduce $\mathrm{MgO}$. This can be...
The reaction, 
Solution This is explained on the basis of $\mathrm{Keq}$, the equilibrium constant. In the given redox reaction, all reactants and products are solids at room temperature, so, there is no...
What is the significance of leaching in the extraction of aluminium?
Solution 2: Aluminium contains silica $\left(\mathrm{SiO}_{2}\right)$, iron oxide $\left(\mathrm{Fe}_{2} \mathrm{O}_{3}\right)$ and titanium oxide $\left(\mathrm{TiO}_{4}\right)$ as impurities....
Which of the ores mentioned can be concentrated by magnetic separation method?
Solution Ores which are magnetic in nature can be separated from non-magnetic gangue particles by magnetic separation method. For ex: ores of iron such as haemetite $\left(\mathrm{Fe} 2...
Specify the oxidation numbers of the metals in the following coordination entities:
(i) $\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}$ Ans: Let us assume that the coordination number of Co is X. Therefore, we can write: $$...
What is meant by unidentate, bidentate and ambidentate ligands? Give two examples for each.
Ans: These are explained below: (i) Unidentate ligand Ligands with only one donor site are called unidentate ligands. For example, $\mathrm{Cl}$ and $\mathrm{NH}_{3}$ are unidentate ligands. (ii)...
Specify the oxidation numbers of the metals in the following coordination entities: (i) ![\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)(\mathrm{CN})(\mathrm{en})_{2}\right]^{2+}](https://www.learnatnoon.com/s/wp-content/ql-cache/quicklatex.com-5830aca5c4a498a25851f5ca5b2a9534_l3.png "Rendered by QuickLaTeX.com")
Ans: Let us assume that the coordination number of Co is X. Therefore, we can write: $$ \begin{array}{l} x+0+(-1)+2(0)=+2 \\ x-1=+2 \\ x=+3 \end{array} $$ So, the coordination number of cobalt is...
What is meant by unidentate, bidentate and ambidentate ligands? Give two examples for each.
Ans: These are explained below: (i) Unidentate ligand Ligands with only one donor site are called unidentate ligands. For example, $\mathrm{Cl}$ and $\mathrm{NH}_{3}$ are unidentate ligands. (ii)...
Explain with two examples each of the following: coordination entity, ligand, coordination number, coordination polyhedron, homoleptic and heteroleptic.
Ans: All of them are explained below: (i) Coordination entity A central metal atom or anions connected to a set number of ions or molecules known as ligands comprises a coordination entity. For...
Ans: Let us see the reactions happening in both the cases. $$ \begin{array}{l} \left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}+\mathrm{FeSO}_{4}+6 \mathrm{H}_{2} \mathrm{O} \rightarrow...
Explain the bonding in coordination compounds in terms of Werner’s postulates.
Ans: Werner's theory is the first theory to explain the nature of bonding in coordination compounds. The main postulates of this theory are: (i) Two types of valencies, primary and secondary...