General principles and processes of isolation of elements practice · Mixed difficulty

For the formation of ${Cr}_2 {O}_3$ and ${Al}_2 {O}_3$, values of $\Delta_f G$ are $540\, \mathrm{k\,J\,mol}^{-1}$ and $-827 \,\mathrm{kJ\,mol}^{-1}$ respectively. What will be the reaction of ${Cr}_2 {O}_3$ by ${Al}$ ?

Assertion : Extraction of ir on metal from iron oxide ore is carried out by heating with coke.

Reason : The reaction,

${Fe}_2 {O}_3(s) \longrightarrow {Fe}(s)+3 / 2 {O}_2(s)$
is a spontaneous process.

The percentage of carbon is same in:

The most abundant ore of iron is:

Silver obtained by argentiferrous lead is purified by:

Select the incorrect match.

In the electrolytic refining of zinc

An Ellingham diagram provides information about

Which process is used for benefication of ores?

Forth floatation process for the concentration of the ores is an illustration of the practical application of

Metallic silver may be obtained from $\mathrm{AgCl}$ by

Which of the following properties does not belong to the complex formed in Mond's process.

Which represents calcination?

Schweitzer’s reagent used for dissolving cellulose in the manufacture of artificial silk is:

Which metal is purified by Pattinson’s process?

Zone refining is based on the principle that

In electrolysis of aluminium oxide which of the following is added to accelerate the process

Metals occur in the native form because of their:

Among the following groups of oxides, the group containing oxides that cannot be reduced by carbon to give the respective metals is

The temperature of blast furnace to produce iron from its ore $\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}$ varies from 500$^\circ C$ at the top of the furnace to about 1900$^\circ C$ at the bottom of the furnace. The reaction between the ore $\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}$ and CO at the lowest temperature ($\sim$500$^\circ C$) is:

Extraction of Ag from commercial lead is possible by:

The inner lining of a blast furnace is made up of:

A carbonate ore is

The final step in the metallurgical extraction of Cu metal from Cu pyrites takes place in a Bessemer converter. The reaction taking place is:

In purification of bauxite by hall’s process

${\text{A}}{{\text{g}}_2}{\text{S}} + \mathop {{\text{KCN}}}\limits_{{\text{Excess}}} \to {\left[ {{\text{Ag}}{{({\text{CN}})}_{\text{x}}}} \right]^{ - {\text{n}}}}$
$\left[\mathrm{Ag}(\mathrm{CN})_{\mathrm{x}}\right]^{-\mathrm{n}}+\mathrm{Zn} \rightarrow\left[\mathrm{Zn}(\mathrm{CN})_{\mathrm{y}}\right]^{-\mathrm{m}}$
Find the sum of $\mathrm{x}$ and $\mathrm{y}$.

Which is incorrect as the uses of lime stone in industries are concerned?

Pig iron:

The ore magnesite is:

Observe the following statements regarding purification of bauxite

I.During Hall’s process, silica is removed as Si (vapour).

II. Bauxite ore contaminated with $\mathrm{F}{\mathrm{e}_2}{\mathrm{O}_3}$ is purified in Baeyer’s process.

III.During Serpeck’s process, AlN is formed.

The correct answer is