JEE Main Metallurgy Previous Year Questions with Solutions

Metallurgy JEE Main previous year questions and solutions are given in this article. Metallurgy is the study of the physical and chemical behaviour of metallic elements, intermetallic compounds, and their mixtures, which are known as alloys. It is defined as a process that is used for the extraction of metals in their pure form. The compounds of metals mixed with soil, limestone, sand and rocks are known as minerals. It deals with the process of purification of metals and the formation of alloys. The questions given here give you an idea about what type of questions to expect from the topic metallurgy. This topic covers 2-3% marks in the chemistry paper and these topics require intensive reading and memory to retain knowledge of the concept.

The important topics that need to be focused for JEE include details on metals and their extraction processes, ores and minerals, refining methods and purification methods which include magnetic separation, froth floatation process and leaching. Metallurgy is one of the simplest topics to score marks in JEE. The problems from this topic are direct and less time-consuming. Questions asked in JEE generally follow a pattern and hence going through important topics at the last moment always helps. BYJU’S provides accurate solutions created by our subject experts. Students can easily download these solutions in PDF format for free.

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JEE Main Previous Year Solved Questions on Metallurgy

1. In Goldschmidt alumino thermic process, which of the following reducing agents is used?

(1) Calcium

(2) Coke

(3) Sodium

(4) Al-powder

Solution:

In Goldschmidt alumino thermic process Aluminium is used as the reducing agent.

Hence option (4) is the answer.

2. The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is:

(1) Cu

(2) Cr

(3) Ag

(4) Ca

Solution:

The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is Calcium. It can be obtained by the electrolysis of molten CaCl2.

Hence option (4) is the answer.

3. The metal extracted by leaching with cyanide is

(1) Mg

(2) Ag

(3) Cu

(4) Na

Solution:

Silver is extracted by leaching with cyanide.

Ag2S + 2NaCN → Na[Ag(CN)2]

2Na[Ag(CN)2] + Zn → Na2[Zn(CN)4] + 2Ag

Hence option (2) is the answer.

4. Aluminium is extracted by the electrolysis of

(1) bauxite

(2) alumina

(3) alumina mixed with molten cryolite

(4) molten cryolite

Solution:

Alumina is mixed with cryolite in the extraction of aluminium metal.

Hence option (3) is the answer.

5. Cyanide process is used for the extraction of

(1) barium

(2) aluminium

(3) boron

(4) silver

Solution:

Cyanide process is used for the extraction of silver. Cyanide forms a soluble complex with silver. Ag is precipitated using zinc.

Hence option (4) is the answer.

6. The smog is essentially caused by the presence of

(1) 02 and 03

(2) 03 and N2

(3) Oxides of sulphur and nitrogen

(4) 02 and N2

Solution:

Smog is smoke + fog. It is caused by a mixture of smoke and sulphur dioxide.

Hence option (3) is the answer.

7. When metal ‘M’ is treated with NaOH, a white gelatinous precipitate ‘X’ is obtained, which is soluble in excess of NaOH. Compound ‘X’ when heated strongly gives an oxide which is used in chromatography as an adsorbent. The metal ‘M’ is

(1) Ca

(2) Al

(3) Fe

(4) Zn

Solution:

Al2O3 is used as an adsorbent in chromatography.

Al + NaOH → Al(OH)3

Al(OH)3 + OH → [Al(OH)4]

Al(OH)3 → Al2O3 + 3H2O

Hence option (2) is the answer.

8. Which of the oxide groups among the following cannot be reduced by carbon?

(1) Fe2O3, ZnO

(2) PbO, Fe2O4

(3) Cu2O, SnO2

(4) CaO, K2O

Solution:

Highly reactive metals like K and Ca cannot be reduced by carbon. The oxides of less electropositive metals like Fe, Zn, Pb, Sn, Cu etc. are reduced by strongly heating them with coal or coke, in the blast furnace.

Hence option (4) is the answer.

9. The ore that contains both iron and copper is

(1) dolomite

(2) malachite

(3) copper pyrites

(4) azurite.

Solution:

Copper pyrite is CuFeS2.

Hence option (3) is the answer.

10. The Mond process is used for the

(1) purification of Ni

(2) purification of Zr and Ti

(3) extraction of Zn

(4) extraction of Mo.

Solution:

The Mond process is used for the extraction and purification of Ni.

Hence option (1) is the answer.

11. The one that is not a carbonate ore is

(1) siderite

(2) calamine

(3) bauxite

(4) malachite.

Solution:

Bauxite is Al2O3 .xH2O. It is not a carbonate ore.

Hence option (3) is the answer.

12. Calamine is an ore of

(1) aluminium

(2) copper

(3) iron

(4) zinc.

Solution:

Calamine (ZnCO3) is an ore of zinc.

Hence option (4) is the answer.

13. Which one of the following ores is best concentrated by froth-flotation method?

(1) Magnetite

(2) Cassiterite

(3) Galena

(4) Malachite.

Solution:

Froth-floatation method is used for the concentration of sulphide ores.Here galena (PbS) is the only sulphide ore.

Hence option (3) is the answer.

14. With respect to ore, Ellingham diagram helps to predict the feasibility of its

(1) zone refining

(2) thermal reduction

(3) electrolysis

(4) vapour phase refining.

Solution:

Ellingham diagrams helps to predict the feasibility of thermal reduction of an ore.

Hence option (2) is the answer.

15. Which of the following factors is of no significance for roasting sulphide ores to the oxides and not subjecting the sulphide ores to carbon reduction directly?

(1) CO2 is more volatile than CS2.

(2) Metal sulphides are thermodynamically more stable than CS2.

(3) CO2 is thermodynamically more stable than CS2.

(4) Metal sulphides are less stable than the corresponding oxides.

Solution:

Oxidising roasting is a type of roasting in metallurgy. It is carried out to remove sulphur and arsenic in the form of their volatile oxides. CS2 is more volatile than CO2. Statement (1) is of no significance for roasting sulphide ores to their oxides.

Hence option (1) is the answer.

16. The correct statement is

(1) zone refining process is used for the refining of titanium

(2) zincite is a carbonate ore

(3) aniline is a froth stabilizer

(4) sodium cyanide cannot be used in the metallurgy of silver.

Solution:

Van Arkel method is used for refining titanium.

Zincite is ZnO.

Aniline is a froth stabilizer.

Sodium cyanide is used in the metallurgy of Ag.

Hence option (3) is the answer.

Also Read:- FAQ Metallurgy JEE