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Science (English Medium) Class 12 - CBSE Important Questions

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What type of colloid is formed when a gas is dispersed in a liquid? Give an example

Appears in 1 question paper
Chapter: [5] Surface Chemistry
Concept: Properties of Colloidal Dispersions

Using IUPAC norms write the formulae for Dichloridobis(ethane-1,2-diamine)cobalt(III)

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Importance and Applications of Coordination Compounds

What type of isomerism is shown by the complex [Co(NH3)5(SCN)]2+?

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

Why is [NiCl4]2− paramagnetic while [Ni(CN)4]2− is diamagnetic? (Atomic number of Ni = 28)

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

Why are low spin tetrahedral complexes rarely observed?

Appears in 1 question paper
Chapter: [5] Coordination Compounds
Concept: Bonding in Coordination Compounds >> Crystal Field Theory (CFT)

Write one difference in Multimolecular colloid and Associated colloid

 

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

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

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

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
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