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Science (English Medium) कक्षा १२ - CBSE Important Questions for Chemistry

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Chemistry
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Write the major products(s) in the following:

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Hydrocarbons: Alkanes >> Reactions of Haloarenes - Reaction with Metals

Write the major products(s) in the following:

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions

What is the role of cryolite in the extraction of aluminium?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals

What is the role of limestone in the extraction of iron from its oxides?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals

Name the method used for the refining of zirconium.

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

What is the role of CO in the extraction of Iron?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals

Reduction of metal oxide to metal becomes easier if the metal obtained is in liquid state. Why?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Oxidation Reduction

Write the main products when n-butyl chloride is treated with alcoholic KOH.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Elimination Reactions

Write the main products when methyl chloride is treated with AgCN.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions

What is the role of zinc metal in the extraction of silver ?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Oxidation Reduction

Describe the roles of the following: SiO2 in the extraction of copper from copper matte

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals

Describe the roles of the following: NaCN in froth floatation process

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

Name the method used for refining of copper metal.

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Occurrence of Metals

Write the principle behind the froth floatation process. What is the role of collectors in this process?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Types of Separation or Concentration of an Ore >> Froth Floatation Method

What is meant by the term “chromatography”?

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

Outline the principles of refining of metals by the following method:

Vapour phase refining

Appears in 1 question paper
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

Arrange the set of compounds in order of increasing boiling points.

Bromomethane, Bromoform, Chloromethane, Dibromomethane.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Physical Properties of Haloalkanes and Haloarenes

What are ambident nucleophiles? Explain with an example.

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Write the structure of the major organic product in the following reaction:

\[\ce{CH3CH2CH2Cl + NaI ->[acetone][heat]}\]

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Methods of Preparation of Haloalkanes

Write the structure of the major organic product in the following reaction:

\[\ce{C6H5ONa + C2H5Cl ->}\]

Appears in 1 question paper
Chapter: [6] Haloalkanes and Haloarenes
Concept: Hydrocarbons: Alkanes >> Reactions of Haloalkanes - Reaction with Metals
< prev  1081 to 1100 of 1512  next > 
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CBSE Science (English Medium) कक्षा १२ Important Questions
Important Questions for CBSE Science (English Medium) कक्षा १२ Biology
Important Questions for CBSE Science (English Medium) कक्षा १२ Chemistry
Important Questions for CBSE Science (English Medium) कक्षा १२ Computer Science (C++)
Important Questions for CBSE Science (English Medium) कक्षा १२ Computer Science (Python)
Important Questions for CBSE Science (English Medium) कक्षा १२ English Core
Important Questions for CBSE Science (English Medium) कक्षा १२ English Elective - NCERT
Important Questions for CBSE Science (English Medium) कक्षा १२ Entrepreneurship
Important Questions for CBSE Science (English Medium) कक्षा १२ Geography
Important Questions for CBSE Science (English Medium) कक्षा १२ Hindi (Core)
Important Questions for CBSE Science (English Medium) कक्षा १२ Hindi (Elective)
Important Questions for CBSE Science (English Medium) कक्षा १२ History
Important Questions for CBSE Science (English Medium) कक्षा १२ Informatics Practices
Important Questions for CBSE Science (English Medium) कक्षा १२ Mathematics
Important Questions for CBSE Science (English Medium) कक्षा १२ Physical Education
Important Questions for CBSE Science (English Medium) कक्षा १२ Physics
Important Questions for CBSE Science (English Medium) कक्षा १२ Political Science
Important Questions for CBSE Science (English Medium) कक्षा १२ Psychology
Important Questions for CBSE Science (English Medium) कक्षा १२ Sociology
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