12th Chemistry Chapter 1 – 2 Mark Questions (Important & Repeated – TN Board)
Prepare for exams with 12th Chemistry Chapter 1 (Metallurgy) important 2 mark questions. This collection includes most repeated and previously asked questions based on TN Board exams, helping students revise key concepts quickly and score better.
Metallurgy – 2 Mark Questions
Most Repeated 2 Marks
Note : Number next to questions tells, how many times it has been repeated in past few years
1.Explain Mond’s process of refining Nickel?(7)
- The impure nickel is heated in a stream of carbon monoxide at around 350 K.
- The nickel reacts with the CO to form a highly volatile nickel tetracarbonyl.
- The solid impurities are left behind.
- On heating the nickel tetracarbonyl around 460 K, the complex decomposes to give pure metal.
Draw above equation in reverse order
2.What are the differences between minerals and ores?(4)
| Minerals | Ores |
| Naturally occurring substances obtained by mining which contain the metals in free state or in the form of compounds like oxides, sulphides etc. are called minerals. | Minerals that contain high percentage of metal from which it can be extracted conveniently and economically are called ores. |
| All minerals are not ores | All ores are minerals |
| Ex : Clay – Mineral of aluminium | Ex : Bauxite – Ore of aluminium |
3.Describe the role of the following in the process mentioned. (4)
(i) Silica in the extraction of copper.
Silica acts as an acidic flux to remove FeO as slag FeSiO3. in the extraction of copper
(ii) Cryolite in the extraction of aluminium:
Cryolite serves as an added impurity and lowers the melting point of the Al2O3 .
iii) Iodine in the refining of Zirconium:
First Iodine forms a Volatile tetraiodide with impure metal, which decomposes to give pure metal. Impure zirconium metal is heated in an evacuated vessel with iodine to form the volatile zirconium tetraiodide (ZrI4). The impurities are left behind, as they do not react with iodine.
iv) Sodium cyanide in froth floatation:
Sodium cyanide acts as a depressing agent in froth floatation process. When a sulphide ore of a metal of interest contains other metal sulphides the depressing agent sodium cyanide selectively prevent other metal sulphides from coming to the froth.
4.What is the role of Limestone in the extraction of Iron from its oxide Fe2O3?(3)
In this extraction, a basic flux, limestone (CaO) is used. Since the silica gangue present in the ore is acidic in nature, the limestone combines with it to form calcium silicate (slag).
5.What are the various steps involved in extraction of pure metals from their ores ? (b/b : 2) (2)
- Coversion of the ore into oxides of the metal of Interest
- Reduction of the metal oxides to elemental Metals
6.Which type of ore can be separated from froth floatation method ?Give two examples.(2)
Sulphide ores can be concentrated by froth floatation method.
E.x : Galena (PbS), Zinc blende (ZnS)
7.Write short notes on Auto reduction? (2)
Simple roasting of some of the ores give the crude metal. In such cases, the use of reducing agents is not necessary. For example, mercury is obtained by roasting of its ore cinnabar (HgS)
8.Define Gangue and slag? (2)
(i) Gangue
- The non metallic impurities, rocky materials and siliceous matter present in the ores are called gangue.
- E.x : SiO2 is the gangue present in the iron ore Fe2O3.
ii) Slag
Slag is a fusible chemical substance formed by the reaction of gangue with a flux.
12th Chemistry Chapter 1 Metallurgy Important 2 Marks Questions
Preparing from previous year question papers is one of the best ways to score high marks in Class 12 Chemistry public exams. In this page, students can find important 2 marks questions from Chapter 1 Metallurgy based on Tamil Nadu State Board syllabus. These questions are collected from previous year public examination papers and repeated important questions.
The chapter Metallurgy is an important unit in 12th Chemistry because it contains concepts related to extraction of metals, concentration of ores, roasting, calcination, refining processes, Ellingham diagram, and metallurgy principles. Students can use these important 2 mark questions for quick revision before examinations.
Practicing 12th Chemistry Metallurgy important questions helps students:
- Understand important concepts clearly
- Improve answer writing skills
- Identify repeated board exam questions
- Prepare for school tests and public exams
- Score better marks in Chemistry examinations
These previous year 2 marks questions are useful for:
- Tamil Nadu State Board Class 12 Students
- Public Exam Preparation
- Quarterly and Half-Yearly Exams
- Revision Before Board Exams
- NEET and Competitive Exam Basics
Students are advised to practice all important 2 mark questions from Metallurgy along with textbook back questions and important derivations. Regular revision of previous year questions can improve confidence and help in better time management during exams.
You can also explore other 12th Chemistry study materials including:
- Important 1 Mark Questions
- 3 Marks and 5 Marks Questions
- Chapter Wise Notes
- Previous Year Question Papers
- Important Diagrams
- Book Back Answers
- Public Exam Most Expected Questions
For more chapter-wise 12th Chemistry important questions and study materials, visit Padidaa.com.
