Isolation of Elements
The purification method based on the following physical transformation is :
$\underset{(X)}{\text { Solid }} \xrightarrow[]{\text { Heat }} \underset{(X)}{\text { Vapour }} \xrightarrow{\text { Cool }} \underset{(X)}{\text { Solid }}$Extraction
Crystallization
Distillation
Sublimation
Given below are two statements related to Ellingham diagram:
Statement I : Ellingham diagrams can be constructed for formation of oxides, sulfides and halides of metals.
Statement II : It consists of plots of $\Delta_{\mathrm{f}} \mathrm{H}^{0}$ vs $\mathrm{T}$ for formation of oxides of elements.
In the light of the above statements, choose the most appropriate answer from the options given below:
Which one of the following is most likely a mismatch ?
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A : In the Ellingham diagram, a sharp change in slope of the line is observed for $\mathrm{Mg} \rightarrow \mathrm{MgO}$ at $\sim 1120^{\circ} \mathrm{C}$
Reason R: There is a large change of entropy associated with the change of state
In the light of the above statements, choose the correct answer from the options given below
Given below are two statements :
Statement I : In the metallurgy process, sulphide ore is converted to oxide before reduction.
Statement II : Oxide ores in general are easier to reduce.
In the light of the above statements, choose the most appropriate answer from the options given below:
In the extraction process of copper, the product obtained after carrying out the reactions
(i) $2 \mathrm{Cu}_{2} \mathrm{~S}+3 \mathrm{O}_{2} \rightarrow 2 \mathrm{Cu}_{2} \mathrm{O}+2 \mathrm{SO}_{2}$
(ii) $2 \mathrm{Cu}_{2} \mathrm{O}+\mathrm{Cu}_{2} \mathrm{~S} \rightarrow 6 \mathrm{Cu}+\mathrm{SO}_{2}$ is called
Gibbs energy vs T plot for the formation of oxides is given below.
For the given diagram, the correct statement is -
Which of the following is used as a stabilizer during the concentration of sulphide ores?
In Hall - Heroult process, the following is used for reducing $\mathrm{Al}_{2} \mathrm{O}_{3}$ :-
Which of the following metals can be extracted through alkali leaching technique?
The setting time of Cement is increased by adding :
Given below are two statements: one is labelled as Assertion A and the other is labelled as Reason R
Assertion A: In an Ellingham diagram, the oxidation of carbon to carbon monoxide shows a negative slope with respect to temperature.
Reason R: CO tends to get decomposed at higher temperature.
In the light of the above statements, choose the correct answer from the options given below
The methods NOT involved in concentration of ore are
A. Liquation
B. Leaching
C. Electrolysis
D. Hydraulic washing
E. Froth floatation
Choose the correct answer from the options given below :
Statement I: During Electrolytic refining, the pure metal is made to act as anode and its impure metallic form is used as cathode.
Statement II: During the Hall-Heroult electrolysis process, purified $\mathrm{Al}_{2} \mathrm{O}_{3}$ is mixed with $\mathrm{Na}_{3} \mathrm{AlF}_{6}$ to lower the melting point of the mixture.
In the light of the above statements, choose the most appropriate answer from the options given below:
In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:
The major component of which of the following ore is sulphide based mineral?
The reaction representing the Mond process for metal refining is _________.
Given below are two statements :
Statement I : In froth floatation method of rotating paddle agitates the mixture to drive air out of it.
Statement II : Iron pyrites and generally avoided for extraction of iron due to environmental reasons.
In the light of the above statements, choose the correct answer from the options given below :
Which one of the following reactions does not occur during extraction of copper?
The metal which is extracted by oxidation and subsequent reduction from its ore is :
Match List I with List II
| List-I |
List-II |
||
|---|---|---|---|
| A. | Reverberatory furnace | I. | Pig Iron |
| B. | Electrolytic cell | II. | Aluminium |
| C. | Blast furnace | III. | Silicon |
| D. | Zone Refining furnace | IV. | Copper |
Choose the correct answer from the options given below :
In metallurgy the term "gangue" is used for :
Which of the reaction is suitable for concentrating ore by leaching process ?
Which of the following methods are not used to refine any metal?
A. Liquation
B. Calcination
C. Electrolysis
D. Leaching
E. Distillation
Choose the correct answer from the options given below:
The metal that is not extracted from its sulfide ore is :
Refining using liquation method is the most suitable for metals with :
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.
The compound(s) that is (are) removed as slag during the extraction of copper is :
(A) CaO
(B) FeO
(C) Al2O3
(D) ZnO
(E) NiO
Choose the correct answer from the options given below:
Match List I with List II.
| List-I Ore |
List-II Composition |
||
|---|---|---|---|
| (A) | Siderite | (I) | FeCO$_3$ |
| (B) | Malachite | (II) | CuCO$_3$ . Cu(OH)$_2$ |
| (C) | Sphalerite | (III) | ZnS |
| (D) | Calamine | (IV) | ZnCO$_3$ |
Choose the correct answer from the options given below :
In isolation of which one of the following metals from their ores, the use of cyanide salt is not commonly involved?
In the metallurgical extraction of copper, following reaction is used :
FeO + SiO2 $\to$ FeSiO3
FeO and FeSiO3 respectively are.
Given are two statements one is labelled as Assertion A and other is labelled as Reason R.
Assertion A : Magnesium can reduce Al2O3 at a temperature below 1350$^\circ$C, while above 1350$^\circ$C, while above 1350$^\circ$C aluminium can reduce MgO.
Reason R : The melting and boiling points of magnesium are lower than those of aluminium.
n light of the above statements, choose most appropriate answer from the options given below :
Statement I : Leaching of gold with cyanide ion in absence of air / O2 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.
Match List-I with List-II
| List - I | List - II | ||
|---|---|---|---|
| (A) | Concentration of gold ore | (I) | Aniline |
| (B) | Leaching of alumina | (II) | NaOH |
| (C) | Froth stabiliser | (III) | SO$_2$ |
| (D) | Blister copper | (IV) | NaCN |
Choose the correct answer from the options given below :
Which of the following is structure of a separating funnel?
The role of depressants in 'Froth Flotation method' is to
Given below are two statements :
Statement I : According to Ellingham diagram, any metal oxide with higher $\Delta$G$^\circ$ is more stable than the one with lower $\Delta$G$^\circ$.
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 :
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 from the options given below.
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 :
Which of the following chemical reactions represents Hall-Heroult Process?
Match List - I with List - II :
| List - I | List -II | ||
|---|---|---|---|
| (A) | Sphalerite | (I) | FeCO$_3$ |
| (B) | Calamine | (II) | PbS |
| (C) | Galena | (III) | ZnCO$_3$ |
| (D) | Siderite | (IV) | ZnS |
Choose the most appropriate answer from the options given below :
Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if iron is _____________.
Explanation:
Siderite, Haematite, Magnetite, Limonite.
(a) Baryte, (b) Galena, (c) Zinc blende and (d) Copper pyrites. How many of these minerals are sulphide based?
Explanation:
Galena :$\mathrm{PbS}$
Zinc blende: $\mathrm{ZnS}$
Copper pyrites : $\mathrm{CuFeS}_{2}$
Of the given minerals, only 3 are sulphide based.
Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of Al2O3 with cryolite.
Reason (R) : The oxidation state of Al in cryolite is +3.
In the light of the above statements, choose the most appropriate answer from the options given below :