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

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Chemistry
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On the basis of crystal field theory, write the electronic configuration for d4 with a strong field ligand for which Δ0 > P.

Appears in 2 question papers
Chapter: [5] Coordination Compounds
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)

How do you convert the following:

Ethanol to propanenitrile

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Given reasons: C–Cl bond length in chlorobenzene is shorter than C–Cl bond length in CH3–Cl.

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

How is ‘cast iron’ different from ‘pig iron’?

Appears in 2 question papers
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Application of Thermodynamic Principles of Metallurgy

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

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

What is the significance of leaching in the extraction of aluminium?

Appears in 2 question papers
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Types of Separation or Concentration of an Ore >> Leaching

In the following pair of halogen compounds, which compound undergoes a faster SN1 reaction?

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Arrange the compounds of the following set in order of reactivity towards SN2 displacement:

2-Bromo-2-methylbutane, 1-Bromopentane, 2-Bromopentane

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Out of PbS and PbCO3 (ores of lead), which one is concentrated by froth floatation process preferably?

Appears in 2 question papers
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

Given reasons: SN1 reactions are accompanied by racemization in optically active alkyl halides.

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloalkanes - Nucleophilic Substitution Reactions

Account for the following :

Iron on reaction with HCl forms FeCl2 nd not FeCl3.

Appears in 2 question papers
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Uses of Aluminium, Copper, Zinc and Iron

What happens when Silver is leached with NaCN in the presence of air? 

Appears in 2 question papers
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining of Crude Metals

Out of (CH3)3 C-Br and (CH3)3 C-I, which one is more reactive towards SN1 and why? 

Appears in 2 question papers
Chapter: [6] Haloalkanes and Haloarenes
Concept: Reactions of Haloarenes - Nucleophilic Substitution

ICl is more reactive than I2.

Appears in 2 question papers
Chapter: [7] P - Block Elements
Concept: Group 17 Elements - The Halogen Family >> Interhalogen Compounds

Write the IUPAC name of the given compound:

Appears in 2 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Nomenclature of Alcohols, Phenols and Ethers

Write the structures of the following molecule: 

H2SO3

Appears in 2 question papers
Chapter: [7] P - Block Elements
Concept: Group 16 Elements - The Oxygen Family >> Oxoacids of Sulphur

Give reasons for the following : H2Te is the strongest reducing agent amongst all the hydrides of Group 16 elements.

Appears in 2 question papers
Chapter: [7] P - Block Elements
Concept: Group 16 Elements - The Oxygen Family

Write the structures of the main products when acetone (CH3 − CO − CH3) reacts with the following reagents :

CH3MgBr and then H3O+

Appears in 2 question papers
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Alcohols

Draw the structures of the following:
(1) HClO4
(2) H3PO3

Appears in 2 question papers
Chapter: [7] P - Block Elements
Concept: Group 17 Elements - The Halogen Family >> Oxoacids of Halogens

Complete the following equation: 

\[\ce{XeF2 + H2O ->}\]

Appears in 2 question papers
Chapter: [7] P - Block Elements
Concept: Group 18 Elements - The Noble gas Family
< prev  521 to 540 of 1313  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
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