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

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Chemistry
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Complete the following reactions : XeF6 + 3H2O →

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements >> Concept of Group 18 Elements

What happens when conc. is H2SO4 added to Cu? Write the equations.

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Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Compounds of Sulphur

What happens when SO3 is passed through water? Write the equations.

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Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Compounds of Sulphur

Complete the following reactions:

XeF6+2H2O ----->

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements >> Concept of Group 18 Elements

What happens when (NH4)2Cr2O7 is heated? Write the equations.

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Chapter: [7] P - Block Elements
Concept: p-Block elements of Group 15 Elements >> Ammonia

Draw the structure of the following:

H2S2O7

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Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Compounds of Sulphur

Draw the structures of the following

XeF6

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements >> Concept of Group 18 Elements

Write the formula of the compound of iodine which is obtained when conc. HNO3 oxidises I2

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Classification of Oxides

Write the IUPAC name of the following compound: 

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Chapter: [7] Alcohols, Phenols and Ethers
Concept: Alcohols, Phenols and Ethers >> Nomenclature

Draw the structures of the following: BrF5

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Chapter: [7] P - Block Elements
Concept: P - Block Group 17 Elements >> Interhalogen Compounds

Arrange the following compounds in the increasing order of their acid strength:

p-cresol, p-nitrophenol, phenol

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Physical and Chemical Properties of Alcohols and Phenols

Write the structures of the products when Butan-2-ol reacts with CrO3

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Chapter: [7] Alcohols, Phenols and Ethers
Concept: Alcohols, Phenols and Ethers >> Nomenclature

Write the structures of the products when Butan-2-ol reacts with SOCl2

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Chapter: [7] Alcohols, Phenols and Ethers
Concept: Alcohols, Phenols and Ethers >> Nomenclature

Give reasons for the following:

Electron gain enthalpies of halogens are largely negative.

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: Compounds of Halogens

Give reasons for the following: N2O5 is more acidic than N2O3

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Chapter: [7] P - Block Elements
Concept: P - Block Group 16 Elements >> Classification of Oxides

Complete the following equations:

 KMnO4 

 

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Chapter: [7] P - Block Elements
Concept: Concept of Group 17 Elements

How will you convert: Phenol to 2, 4, 6 − trinitrophenol?

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Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Alcohols

Which allotrope of sulphur is thermally stable at room temperature ?

Appears in 1 question paper
Chapter: [7] P - Block Elements
Concept: p-Block elements of Group 15 Elements >> Phosphorus - Allotropic Forms

Name the reagents used in the following reactions:

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Alcohols

Write the structures of main products when benzene diazonium chloride (C6 H5 N+2CI)C6 H5 N2+CI- reacts with the  :  HBF4/∆

Appears in 1 question paper
Chapter: [7] Alcohols, Phenols and Ethers
Concept: Methods of Preparation of Phenols
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