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JEE Mains | PYQ

In the leaching of alumina from bauxite, the ore expected to leach out in the process by reacting with \( \mathrm{NaOH} \) is:

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

Which one of the following is most likely a mismatch?

In liquation process used for tin \( \mathrm{(Sn)} \), the metal

Consider two chemical reactions \( (A) \) and \( (B) \) that take place during metallurgical process:
\( (A)\displaystyle \text{ZnCO}_{3\text{ (s)}} \xrightarrow{\Delta} \text{ZnO}_{\text{ (s)}} + \text{CO}_{2\text{ (g)}}\)
\( (B)\displaystyle 2\text{ZnS}_{\text{ (s)}} + 3\text{O}_{2\text{ (g)}} \xrightarrow{\Delta} 2\text{ZnO}_{\text{ (s)}} + 2\text{SO}_{2\text{ (g)}} \)
The correct option of names given to them respectively is:

Among the following ores Bauxite, Siderite, Cuprite, Calamine, Haematite, Kaolinite, Malachite, Magnetite, Sphalerite, Limonite, Cryolite, the number of principal ores if iron is________.

Which of the reaction is suitable for concentrating ore by leaching process?

Among following compounds, the number of those present in copper matte is _______.
\((A)\) \( \mathrm{CuCO_3} \) \((B)\) \( \mathrm{Cu_2S} \) \((C)\) \( \mathrm{Cu_2O} \) \((D)\) \( \mathrm{FeO} \)

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

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 methods NOT involved in concentration of ore are:
\( (A) \) Liquation \( \quad (B) \) Leaching \( \quad (C) \) Electrolysis \( \quad (D) \) Hydraulic washing \( \quad (E) \) Froth floatation
Choose the correct answer from the options given below:

A D-aldotetrose on oxidation with concentrated \(\mathrm{HNO_3}\) resulted in optically inactive dicarboxylic acid. The structure of the D-aldotetrose is:

The major component of which of the following ore is sulphide based mineral?

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R).
Assertion (A) : Aluminium is extracted from bauxite by the electrolysis of molten mixture of \( \mathrm{Al_2O_3} \) 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:

Which one of the following statements is incorrect?

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:

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 \( \text{Mg} \rightarrow \text{MgO} \) at \( \sim 1120^\circ \text{C} \)
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 option given below.

In the extraction of copper, its sulphide ore is heated in a reverberatory furnace after mixing with silica to:

Match List -I with List II

Choose the correct answer from the options given below:

The statement that is INCORRECT about Ellingham diagram is :

Refining using liquation method is the most suitable for metals with:

Match List I with List II.

Choose the correct answer from the options given below:

Given below are two statements:
Statement I: In froth floatation method a rotating paddle agitates the mixture to drive air out of it.
Statement II: Iron pyrites are 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:

Given below are two statements:
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 \( \mathrm{Al_2O_3} \) is mixed with \( \mathrm{Na_3AlF_6} \) 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:

Match List-I with List – II:

The metal that can be purified economically by fractional distillation method is:

The reaction representing the Mond process for metal refining is ________.

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.
Assertion A : The reduction of a metal oxide is easier if the metal formed is in liquid state than solid state.
Reason R : The value of \( \Delta G^\ominus \) becomes more on negative side as entropy is higher in liquid state than solid state.
In the light of the above statements, choose the most appropriate answer from the options given below.

The compound(s) that is(are) removed as slag during the extraction of copper is:
I. \( \mathrm{CaO} \) II. \( \mathrm{FeO} \) III. \( \mathrm{Al_2O_3} \) IV. \( \mathrm{ZnO} \) V. \( \mathrm{NiO} \)
Choose the correct answer from the option given below:

Given below are two statements:
Statement I: In the metallurgy process, sulphate 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:

Given are two statements one is labelled as Assertion A and other is labelled as Reason R.
Assertion A: Magnesium can reduce \( \mathrm{Al_{2}O_{3}} \) at a temperature below \( 1350^{\circ}\mathrm{C} \), while above \( 1350^{\circ}\mathrm{C} \) Aluminium can reduce \( \mathrm{MgO} \).
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:

Addition of \( \mathrm{H_2SO_4} \) to \( \mathrm{BaO_2} \) produces:

The addition of silica during the extraction of copper from its sulphide ore:

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

Given below are two statements:
Statement I: According to the 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:

The metal which is extracted by oxidation and subsequent reduction from its ore is:

Which one of the following is not an example of calcination?

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.

The role of depressants in ‘Froth Floatation method’ is to:

Given below are two statements:
Statement I: In ‘Lassaigne’s Test’, when both nitrogen and sulphur are present in an organic compound, sodium thiocyanate is formed.
Statement II: If both nitrogen and sulphur are present in an organic compound, then the excess of sodium used in sodium fusion will decompose the sodium thiocyanate formed to give \( \mathrm{NaCN} \) and \( \mathrm{Na_2S} \).
In the light of the above statements, choose the most appropriate answer from the options given below:

Which refining process is generally used in the purification of low melting metals?

Gibbs energy vs \( T \) plot for the formation of oxides is given below:

For the given diagram, the correct statement is:

In the extraction process of copper, the product obtained after carrying out the reactions
(i) \( 2\mathrm{Cu_2S} + 3\mathrm{O_2} \rightarrow 2\mathrm{Cu_2O} + 2\mathrm{SO_2} \)      (ii) \( 2\mathrm{Cu_2O} + \mathrm{Cu_2S} \rightarrow 6\mathrm{Cu} + \mathrm{SO_2} \)
is called:

In Hall-Heroult process, the following is used for reducing \( \mathrm{Al_2O_3} \) :

Which of the following methods are not used to refine any metal?
(I) Liquation          (II) Calcination
(III) Electrolysis     (IV) Leaching
(V) Distillation
Choose the correct answer from the options given below:

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 \( \Delta_{\mathrm{f}} H^{0} \) vs \( T \) formation of oxides of elements.
In the light of the above statements, choose the most appropriate answer from the options given below :

Match List-I with List-II.

Choose the most appropriate answer from the options given below:

Calamine and Malachite, respectively, are the ores of:

The parameters of the unit cell of a substance are \( a = 2.5 \), \( b = 3.0 \), \( c = 4.0 \), \( \alpha = 90^\circ \), \( \beta = 120^\circ \), \( \gamma = 90^\circ \). The crystal system of the substance is :

Which of the following is used as a stabilizer during the concentration of sulphide ores?

In metallurgy the term “gangue” is used for:

The point of intersection and sudden increase in the slope, in the diagram given below, respectively, indicates:

Match List I with List II : (Both having metallurgical terms)

Choose the correct answer from the options given below:

Match Column I with Column II:


Choose the correct answer from the options given below :

The chemical that is added to reduce the melting point of the reaction mixture during the extraction of aluminium is:

In the electrolytic refining of blister copper, the total number of main impurities, from the following removed as anode mud is ________ . Pb, Sb, Se, Te, Ru, Ag, Au and Pt

Which of the following reduction reaction CANNOT be carried out with coke?

In the metallurgical extraction of copper, following reaction is used:
\( \mathrm{FeO} + \mathrm{SiO_2} \rightarrow \mathrm{FeSiO_3} \)
\( \mathrm{FeO} \) 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?