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JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Introduction and Snapshot of General Principles and Processes of Isolation of Elements - Study ref# 866

Introduction: A few elements like carbon, Sulphur, gold and noble gases, occur in free state while others in combined forms in the earth’s crust. The extraction and isolation of an element from its combined form involves various princi... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Introduction and Snapshot of General Principles and Processes of Isolation of Elements - Study ref# 867

Following sections must be covered to understand the General Principles and Processes of Isolation of Elements: 1. Occurrence of Metals 2. Concentration of Ores 3. Extraction of Crud Metal from Concentrated Ore 4. Thermodynamic P... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Target Setup for General Principles and Processes of Isolation of Elements - Study ref# 868

Student requires to achieve the following milestones to get better grip over General Principles and Processes of Isolation of Elements. The milestones / targets are as follows: Starting Point: Days 0Test TypeAppear on TestTarget ... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9796

Which of the following reactions is an example of autoreduction? (a)   (b)   (c)  ... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9797

Zone refining is based on the principle that (a) Impurities of low boiling metals can be separated by distillation. (b) Impurities are more soluble in molten metal than in solid metal. (c) Different components of a mixture are di... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9798

In the extraction of copper from its sulphide ore, the metal is formed by the reduction of  with (a) FeS (b) CO (c) (d) read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9799

Brine is electrolyzed by using inert electrodes. The reaction at anode is……. (a)   (b) (c) read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9800

Electrolytic refining is used to purify which of the following metals? (a) Cu and Zn (b) Ge and Si (c) Zr and Ti (d) Zn and Hg Answer: Copper and zinc are two metals which are generally purified by using electrolyte refining. In thi... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9801

Extraction of gold and silver involves leaching the metal from CN- ion. The metal is recovered by…… (a) Displacement of metal by some other metal from the complex ion. (b) Roasting of metal complex (c) Calcination followed by... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9802

Which of the following options are correct? (a) Cast iron is obtained by remelting pig iron with scrap iron and coke using hot air blast. (b) In extraction of silver, silver is extracted as cationic complex. (c) Nickel is purified b... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9803

Which of the following statements is correct about the role of substances added in the froth floatation process? (a) Collectors enhance the non-wettability of the mineral particles. (b) Collectors enhance the wettability of gangue part... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9804

Common impurities present in bauxite are…… (a) CuO (b) ZnO (c) Fe2O3 (d) SiO2 Answer: (c, d) Bauxite is an ore of aluminum which contain Fe2O3 and SiO2 as common impurities.... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9805

Why is an external emf of more than 2.2V required for the extraction of Cl2 from brine? Answer:   For given reaction, value of is + 422 kJ. Using read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9806

At temperature above 1073 K, coke can be used to reduce FeO to Fe. How can you justify this reduction with Ellingham diagram? Answer: Using Ellingham diagram, we observe that at temperature greater than 1073 K; read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9807

Wrought iron is the purest form of iron. Write a reaction used for the preparation of wrought iron from cast iron. How can the impurities of Sulphur, silicon and phosphorus be removed from cast iron? Answer: (a) read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9808

Although carbon and hydrogen are better reducing agents but they are not used to reduce metallic oxides at high temperatures. Why? Answer: Because at high temperatures, carbon and hydrogen react with metals to form carbides and hydrides resp... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9809

How do we separate two sulphide ores by froth floatation method? Explain with an example. Answer: Two sulphide ores can be separated by adjusting the proportion of oil and water or by using depressants, e.g., if an ore contains ZnS and PbS b... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9810

The mixture of compounds A and B is passed through a column of Al2O3 by using alcohol as eluant. Compound A is eluted in preference to compound B. Which of the following A or B, is more readily adsorbed on the column? Answer: Compounds whic... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9811

Why is sulphide ore of copper heated in a furnace after mixing with silica? Answer: Silica (flux) being an acidic flux removes the impurities of iron oxide the basic impurity, by reacting with it. Thus, iron silicate (slag) is formed.    ... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9812

Why are sulphide ores converted to oxide before reduction? Answer:  This is because oxides are reduced to metals easily while sulphides are not. So, sulphide ores are converted to oxide before reduction.... read more

JEE-Main - Grade 12 - Chemistry - General Principles and Processes of isolation of elements - Study ref# 9813

What is the role of flux in metallurgical processes? Answer: Role of flux in metallurgical process (i) Flux is used to remove the gangue by combining with it. Thus, slag formation takes place. (ii) It makes the molten mass more conduct... read more

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