Oxidation-Reduction in Metallurgy

In  the process of extraction of gold,

Roasted gold ore

$\left[X\right]+Zn\stackrel{}{\to }\left[Y\right]+Au$

Serpeck's method involves the heating of bauxite with

The extraction of gold involves leaching the metal with ${\mathrm{CN}}^{-}$, the metal is later recovered by displacement method using a zinc metal. In this reaction, zinc acts as a 

In the fusion of chromite ore with sodium carbonate in excess of air which of the following is not formed.

Which one of the following metais cannot be extracted by carbon reduction?

Select the incorrect statement:

Electrometallurgy is used for?
 

Which process use in smelting during metallurgy of copper?

What will be the the general method for the extraction of metal from oxide ore ?

What evidence suggests that the Harappan Civilization faced a decline?

Cotyledons are also called-

Pb and Sn are extracted from their chief ore by

By which process $\mathrm{P}\mathrm{b}$ and $\mathrm{S}\mathrm{n}$ are extracted respectively?

Which one of the following metals is extracted by a carbon reduction process?

When a metal is extracted from its ore, if the gangue associated with the ore is silica, then

Consider the following metallurgical process:

$\left(\mathrm{I}\right)$ Heating impure metal with $\mathrm{CO}$, and distilling the resulting volatile carbonyl (boiling point $43°\mathrm{C}$) and finally decomposition at $150°\mathrm{C}‐200°\mathrm{C}$ to get the pure metal.

$\left(\mathrm{II}\right)$ Heating the sulphide ore in the air until a part is converted to oxide, and then further heating in the absence of air to let the oxide react with unchanged metal sulphide.

$\left(\mathrm{III}\right)$ Electrolysis of the molten electrolyte containing approximately equal amounts of the metal chloride, and $\mathrm{NaCl}$ to obtain the metal.

The process used for obtaining magnesium, nickel and copper are, respectively.

${\mathrm{FeCr}}_2{\mathrm{O}}_4$ (chromite) is converted to $\mathrm{Cr}$ by the following steps:

$\mathrm{Chromite}\stackrel{\mathrm{I}}{\to }{\mathrm{NaCrO}}_4\stackrel{\mathrm{II}}{\to }{\mathrm{Cr}}_2{\mathrm{O}}_3\stackrel{\mathrm{III}}{\to }\mathrm{Cr}$

The reagents in $\mathrm{I}, \mathrm{II}$ and $\mathrm{III}$-step might be:

Give the correct order of the initials $\mathrm{T}$ or $\mathrm{F}$ for the following statements. Use $\mathrm{T}$, if the statement is true, and $\mathrm{F}$ if it is false.

$\left(\mathrm{i}\right)$ In the Goldschmidt thermite process, aluminium acts as a reducing agent.

$\left(\mathrm{ii}\right)$ $\mathrm{Mg}$ is extracted by electrolysis of an aqueous solution of ${\mathrm{MgCl}}_2$.

$\left(\mathrm{iii}\right)$ The extraction of $\mathrm{Pb}$ is possible by the carbon reduction method.

$\left(\mathrm{iv}\right)$ The red bauxite is purified by the Serpeck's process.