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

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Chemistry
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Using IUPAC norms, write the formula of Hexaamminecobalt(III) sulphate.

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Nomenclature of Animes

What is the role of pyridine in the acylation reaction of amines?

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Chemical Reactions of Amines - Alkylation and Acylation

An organic compound (A) with molecular formula C3H7NO on heating with Br2 and KOH forms a compound (B). Compound (B) on heating with CHCl3 and alcoholic KOH produces a foul-smelling compound (C) and on reacting with C6H5SO2Cl forms a compound (D) which is soluble in alkali. Write the structure of (A), (B), (C) and (D).

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Nomenclature of Animes

Give reasons:

(CH3)2NH is more basic than (CH3)3N in an aqueous solution.

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Identification of Primary, Secondary and Tertiary Amines

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

Appears in 3 question papers
Chapter: [9] Amines
Concept: Diazonium Salts >> Chemical Reaction of Diazonium Salts - Reactions Involving Displacement of Nitrogen

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

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Chemical Reactions of Amines - Reaction with Nitrous Acid

Arrange the following in increasing order of their boiling point:

C2H5OH, C2H5NH2, (C2H5)3N

Appears in 3 question papers
Chapter: [9] Amines
Concept: Physical Properties of Amines

Which of the following would not be a good choice for reducing nitrobenzene to aniline?

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Preparation of Amines

How can the activating effect of the −NH2 group in aniline be controlled?

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Chemical Reactions of Amines - Electrophilic Substitution

Explain why (CH3)2NH is more basic than (CH3)3N in aqueous solution.

Appears in 3 question papers
Chapter: [9] Amines
Concept: Amines >> Identification of Primary, Secondary and Tertiary Amines

Illustrate Sandmeyer's reaction with an equation.

Appears in 3 question papers
Chapter: [9] Amines
Concept: Diazonium Salts >> Chemical Reaction of Diazonium Salts - Reactions Involving Displacement of Nitrogen

Write the name of two monosaccharides obtained on hydrolysis of lactose sugar.

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Carbohydrates >> Monosaccahrides

Which one of the following is a disaccharide : Starch, Maltose, Fructose, Glucose ?

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Carbohydrates >> Oligosaccharides

Write the name of vitamin whose deficiency causes bone deformities in children.

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Introduction of Vitamins

Answer the following question.
Write the products obtained after the hydrolysis of lactose.

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Carbohydrates >> Disaccharides - Sucrose, Maltose and Lactose

Define the following term: 

Nucleotide

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Introduction of Nucleic Acids

What are the hydrolysis products of sucrose?

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Classification of Carbohydrates

Write the products of the following reactions:

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Carbohydrates >> Oligosaccharides

Write the products of the following reactions:

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Carbohydrates >> Oligosaccharides

Write the products of the following reactions:

Appears in 3 question papers
Chapter: [10] Biomolecules
Concept: Biomolecules in the Cell > Carbohydrates >> Oligosaccharides
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