Metallurgy

The correct statement(s) related to processes involved in the extraction of metals is(are)

The electrochemical extraction of aluminum from bauxite ore involves

The correct option(s) related to the extraction of iron from its ore in the blast furnace operating in the temperature range 900 - 1500 K is(are)

Match List - I with List - II :

Choose the most appropriate answer from the options given below :

Which of the following chemical reactions represents Hall-Heroult Process?

(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?

Leaching of gold with dilute aqueous solution of NaCN in presence of oxygen gives complex [A], which on reaction with zinc forms the elemental gold and another complex [B]. [A] and [B], respectively are :

Given below are two statements.

Statement I: During electrolytic refining, blister copper deposits precious metals.

Statement II: In the process of obtaining pure copper by electrolysis method, copper blister is used to make the anode.

In the light of the above statements, choose the correct answer from the options given below.

Given below are two statements :

Statement I : According to the Ellingham diagram, any metal oxide with higher $\Delta G°$ is more stable than the one with lower $\Delta G°$.

Statement II : The metal involved in the formation of oxide placed lower in the Ellingham diagram can reduce the oxide of a metal placed higher in the diagram.

In the light of the above statements, choose the most appropriate answer from the options given below :

The role of depressants in 'Froth Floation method' is to

Match List - I with List - II.

Choose the correct answer from the options given below.

Statement I: Leaching of gold with cyanide ion in absence of air / $\mathrm{O_2}$ leads to cyano complex of Au(III).

Statement II: Zinc is oxidized during the displacement reaction carried out for gold extraction.

In the light of the above statements, choose the correct answer from the options given below.

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.

Assertion A : Magnesium can reduce $\mathrm{Al_2O_3}$ at a temperature below 1350°C, while above 1350°C aluminium can reduce MgO.

Reason R : The melting and boiling points of magnesium are lower than those of aluminium.

In light of the above statements, choose most appropriate answer from the options given below :

In the metallurgical extraction of copper, following reaction is used :

$$\mathrm{FeO+SiO_2\rightarrow FeSiO_3}$$

FeO and $\mathrm{FeSiO_3}$ respectively are.

In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved ?

Match List I with List II.

Choose the correct answer from the options given below:

$\Delta G^\circ$ vs T plot for the formation of MgO, involving reaction $\mathrm{2Mg+O_2\rightarrow2MgO}$, will look like :

Blister copper is produced by reaction of copper oxide with copper sulphide.

$$\mathrm{2Cu_2O+Cu_2S\rightarrow6Cu+SO_2}$$

When $2.86\times10^3$ g of $\mathrm{Cu_2O}$ and $4.77\times10^3$ g of $\mathrm{Cu_2S}$ are used for reaction, the mass of copper produced is ______ g. (nearest integer)

(Atomic mass of Cu = 63.5 a.m.u, S = 32.0 a.m.u, O = 16.0 a.m.u)

The compound(s) that is(are) removed as slag during the extraction of copper is :

(A) CaO

(B) FeO

(C) $\mathrm{Al_2O_3}$

(D) ZnO

(E) NiO

Choose the correct answer from the options given below :

Given below are two statements.

Statement I: Pig iron is obtained by heating cast iron with scrap iron.

Statement II: Pig iron has a relatively lower carbon content than that of cast iron.

In the light of the above statements, choose the correct answer from the options given below.