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Science (English Medium) Class 12 - CBSE Important Questions

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Why is adsorption always exothermic?

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

Explain what is observed when an electric current is passed through a colloidal sol?

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

Explain [Co(NH3)6]3+ is an inner orbital complex, whereas [Ni(NH3)6]2+ is an outer orbital complex.

[At. No.: Co = 27, Ni = 28]

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

What is meant by unidentate ligand?

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

What happens when PCl5 is heated? Write the equations involved.

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

Write one difference between Multimolecular colloid and Macromolecular colloid

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

Write one difference between Multimolecular colloid and Macromolecular colloid

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

Write one difference between Sol and Gel

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

Write one difference between Sol and Gel

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

Write one difference between O/W emulsion and W/O emulsion

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

Write one difference between O/W emulsion and W/O emulsion

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

What type of isomerism is shown by the complex [Co(en)3]Cl3

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

Write the hybridisation and magnetic character of [Co(C2O4)3]3–.

(At. no. of Co = 27)

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

Write IUPAC name of the following Complex [Cr(NH3)3Cl3]

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

Complete the following reactions

NH3+3Cl2(excess) ---->

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

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)
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