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JEE Mains | PYQ

Which one of the following reactions does not occur during extraction of copper?

Which of the following metals can be extracted through alkali leaching technique?

Which one of the following is most likely a mismatch?

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

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:

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

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:

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:

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

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:

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?

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 \( \mathrm{Al_2O_3} \) :

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 :

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

Match Column I with Column II:


Choose the correct answer from the options given below :