Metallurgy · JEE Main previous year questions

2022 6 questions

1. Q772022 · 29 Jul 2022 · Shift 1

   In metallurgy the term "gangue" is used for :

   1. A.Contamination of undesired earthy materials.
   2. B.Contamination of metals, other than desired metal.
   3. C.Minerals which are naturally occurring in pure form
   4. D.Magnetic impurities in an ore.
   Show answer

   Answer: A

2. Q752022 · 28 Jul 2022 · Shift 1

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

   1. A.$2{\text{Cu}}_2\text{S}+3{\text{O}}_2\to 2{\text{Cu}}_2\text{O}+2{\text{SO}}_2$
   2. B.${\text{Fe}}_3{\text{O}}_4+\text{CO}\to 3\text{FeO}+{\text{CO}}_2$
   3. C.${\text{Al}}_2{\text{O}}_3+2\text{NaOH}+3{\text{H}}_2\text{O}\to 2\text{Na}[{\text{Al(OH)}}_4]$
   4. D.${\text{Al}}_2{\text{O}}_3+6\text{Mg}\to 6\text{MgO}+4\text{Al}$
   Show answer

   Answer: C

3. Q762022 · 26 Jul 2022 · Shift 1

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

   1. A.Low melting point
   2. B.High boiling point
   3. C.High electrical conductivity
   4. D.Less tendency to be soluble in melts than impurities
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   Answer: A

4. Q722022 · 27 Jun 2022 · Shift 1

   Match List-I with List-II $$\begin{array}{llll}& \text{List - I}& & \text{List - II}\\ \text{(A)}& \text{Concentration of gold ore}& \text{(I)}& \text{Aniline}\\ \text{(B)}& \text{Leaching of alumina}& \text{(II)}& \mathrm{NaOH}\\ \text{(C)}& \text{Froth stabiliser}& \text{(III)}& \mathrm{S}{\mathrm{O}}_2\\ \text{(D)}& \text{Blister copper}& \text{(IV)}& \mathrm{NaCN}\end{array}$$ Choose the correct answer from the options given below :

   1. A.(A) - (IV), (B) - (III), (C) - (II), (D) - (I)
   2. B.(A) - (IV), (B) - (II), (C) - (I), (D) - (III)
   3. C.(A) - (III), (B) - (II), (C) - (I), (D) - (IV)
   4. D.(A) - (II), (B) - (IV), (C) - (III), (D) - (I)
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   Answer: B

5. Q732022 · 26 Jun 2022 · Shift 1

   Given below are two statements : Statement I : According to Ellingham diagram, any metal oxide with higher $\Delta {\mathrm{G}}^{\circ }$ is more stable than the one with lower $\Delta {\mathrm{G}}^{\circ }$. 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 :

   1. A.Both Statement I and Statement II are correct.
   2. B.Both Statement I and Statement II are incorrect.
   3. C.Statement I is correct but Statement II is incorrect.
   4. D.Statement I is incorrect but Statement II is correct.
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   Answer: D

6. Q762022 · 26 Jun 2022 · Shift 2

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

   1. A.selectively prevent one component of the ore from coming to the froth.
   2. B.reduce the consumption of oil for froth formation.
   3. C.stabilize the froth.
   4. D.enhance non-wettability of the mineral particles.
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   Answer: A