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Science (English Medium) Class 12 - CBSE Important Questions for 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
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