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

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Chemistry
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Write the chemical method by which Fe(OH)3 sol is prepared from FeCl3.

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Preparation of Colloids

Write the structures of compounds A, B and C in the following reactions:

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds

Write the structures of compounds A, B and C in the following reactions

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Definitions of Some Important Terms Pertaining to Coordination Compounds

Write the IUPAC names of the following coordination compounds: 

[CoBr2(en)2]+, (en = ethylenediamine)

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds

Write the fomulae of the following compounds :

Tetraaquodichlorochromium (III) chloride

 

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities

Write the fomulae of the following compounds

Potassium tetracyanoaurate (III) ion

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities

Physisorption is reversible while chemisorption is irreversible. Why ?

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Types of Adsorption

Write down the IUPAC name of the following complex :

[Cr(en)3]Cl3

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds

Why is Butan-1-ol optically inactive but Butan-2-ol is optically active?

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Isomerism in Coordination Compounds >> Stereoisomerism

Write the hybridization type and magnetic behaviour of the complex [Ni(CN)4]2−. (Atomic number of Ni = 28)

 

 
Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Bonding in Coordination Compounds >> Magnetic Properties of Coordination Compounds

Give reasons for the following observations :

NH3 gas adsorbs more readily than N2 gas on the surface of charcoal.

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Adsorption >> Mechanism of Adsorption

Give reasons for the following observations :

 Powdered substances are more effective  adsorbents.

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Types of Adsorption

Account for the following :

Bond angle in NH+4NH4+ is higher than NH3.

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Bonding in Coordination Compounds - Introduction

Give one example each of 'oil in water' and 'water in oil' emulsion.

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Emulsions

Write the IUPAC name of the compound.

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds

How will you convert the following?

Aniline into N−phenylethanamide

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds

Give one example each of sol and gel.

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Classification of Colloids >> Classification Based on Physical State of Dispersed Phase and Dispersion Medium

Write the IUPAC name of the compound

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Naming of Mononuclear Coordination Compounds

Write the IUPAC name of the compound.

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities

Write IUPAC name of the complex K3 [Cr (C2O4)3] 

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Nomenclature of Coordination Compounds - Formulas of Mononuclear Coordination Entities
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