Extraction of Important Elements from their Ores

The carbon-based reduction method is NOT used for the extraction of

(a) tin from ${\mathrm{SnO}}_2$
(b) iron from ${\mathrm{Fe}}_2{\mathrm{O}}_3$
(c) aluminium from alumina
(d) magnesium from ${\mathrm{MgCO}}_3.{\mathrm{CaCO}}_3$

In the cyanide extraction process of silver from argentite ore, the oxdising and reducing agents used are :

A metal obtained by a hydrometallurgical operation is:

The following flow diagram represents the extraction of magnesium from sea water.

Which of the following option describes the correct reactants, products and reaction conditions?

In the equation,

$4\mathrm{M}+8{\mathrm{CN}}^{-}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2\to 4{\left(\mathrm{M}(\mathrm{CN}{)}_2\right)}^{-}+4{\mathrm{OH}}^{-}$

Identify the metal ($\mathrm{M}$).

$4\mathrm{M}+8{\mathrm{CN}}^{-}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2\to 4{\left(\mathrm{M}(\mathrm{CN}{)}_2\right)}^{-}+4{\mathrm{OH}}^{-}$

Silver is obtained from $\mathrm{Na}\left[\mathrm{Ag}(\mathrm{CN}{)}_2\right]$ by reaction with:
 

Leaching the silver and gold metal with $\mathrm{CN}$-:
 

In the extraction of silver from argentite air is passed through aqueous solution because:
 

Chemical reduction method is not used for:
 

$\mathrm{NaCl}$ and ${\mathrm{CaCl}}_2$ are added to fused ${\mathrm{MgCl}}_2$ in the electrolysis of ${\mathrm{MgCl}}_2$, because:
 

Which of the following option represents the species $\mathrm{X}$ and $\mathrm{Y}$ in the leaching of :
$4\mathrm{Ag}+8{\mathrm{CN}}^{-}+2{\mathrm{H}}_2\mathrm{O}+{\mathrm{O}}_2⟶4\left(\mathrm{X}\right)+4{\mathrm{OH}}^{-}$
$2\left(\mathrm{X}\right)+\mathrm{Zn}⟶\left(\mathrm{Y}\right)+2\mathrm{Ag}$
 

Which process is used to extract $\mathrm{Ag}$ from commercial lead?

Leaching of silver is carried out by heating it with a dilute solution of

If dichloromethane (DCM) and water are used for differential extraction, then which of the following statements is correct?

Which of the following reactions is incorrect?

$\mathrm{A}{\mathrm{g}}_2\mathrm{S}+\mathrm{N}\mathrm{a}\mathrm{C}\mathrm{N}\to \mathrm{A}\stackrel{\mathrm{Z}\mathrm{n}}{\to }\mathrm{B}$ ,Hence A and B are -

$HN{O}_3$ in the presence of $Mn{\left(N{O}_3\right)}_2$ produces a pink coloured solution when treated with $Pb{O}_2.$ The pink colour is due to the formation of

Which of the following reagent(s) can liberate at least one gaseous product with solid ${\mathrm{MnO}}_2$ ?

$\left(\mathrm{I}\right)\mathrm{conc}.\mathrm{HCl}\mathrm{ }$

$\left(\mathrm{II}\right)\mathrm{ }\mathrm{conc}\mathrm{ }{\mathrm{H}}_2{\mathrm{SO}}_4$

$\left(\mathrm{III}\right)\mathrm{ }{\mathrm{H}}_2{\mathrm{C}}_2{\mathrm{O}}_4/{\mathrm{H}}_2{\mathrm{SO}}_4$

$\left(\mathrm{IV}\right)\mathrm{ }{\mathrm{H}}_2{\mathrm{O}}_2/{\mathrm{H}}_2{\mathrm{SO}}_4$

Which of the following metal is extracted by the amalgamation process?

Sulphide mineral $+{\text{CN}}^{-}\stackrel{{\text{O}}_2}{⟶}{\left[\text{M}{\left(\text{CN}\right)}_2\right]}^{-}$

$2{\left[\text{M}{\left(\text{CN}\right)}_2\right]}^{-}+\text{Zn}⟶{\left[\text{Zn}{\left(\text{CN}\right)}_4\right]}^{2-}+2\text{M}$
In the above reaction, M can be -