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ISC (Science) ISC Class 12 - CISCE Important Questions for Chemistry (Theory)

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Chemistry (Theory)
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Give balanced equations for the following reaction :

Methyl magnesium bromide with ethyl alcohol. 

Appears in 2 question papers
Chapter: [0.115] Preparation, properties, and uses of the following
Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction

Complete and balance the chemical equation:

\[\ce{K2Cr2O7 + H2SO4 + KI →}\] _____ + _____ + _____ + _____.

Appears in 2 question papers
Chapter: [0.115] Preparation, properties, and uses of the following
Concept: Preparation, Properties, and Uses of the Following: Ethyl Bromide, Chloroform, Iodoform, Haloform Reaction

Give a balanced equation for the preparation of salicylaldehyde from phenol.

Appears in 2 question papers
Chapter: [0.121] Methods of preparation, manufacture, properties and use
Concept: Alcohol > Methods of Preparation

Complete and balance the following chemical equation:

\[\ce{KMnO4 + KI + H2SO4 → }\]_____ + _____ + _____ + ______

Appears in 2 question papers
Chapter: [0.121] Methods of preparation, manufacture, properties and use
Concept: Methods of Preparation and Manufacture of Alcohol > Manufacture of Methanol by Bosch Process and Ethanol by Fermentation of Carbohydrates

Complete and balance the following chemical equation:

\[\ce{K2Cr2O7 + H2SO4 + H2S →}\]____ + ____ + ____ + ____

Appears in 2 question papers
Chapter: [0.121] Methods of preparation, manufacture, properties and use
Concept: Methods of Preparation and Manufacture of Alcohol > Manufacture of Methanol by Bosch Process and Ethanol by Fermentation of Carbohydrates

Write a chemical test to distinguish between ethanol and phenol.

Appears in 2 question papers
Chapter: [0.12300000000000001] Distinction between primary, secondary and tertiary alcohols
Concept: Phenols > Phenols

Give one chemical test to distinguish between the following pair of compounds:

Acetaldehyde and benzaldehyde

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Uses of Aldehydes and Ketones

Give a balanced equation for the following name reaction:

Clemmensen’s reduction.

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Aldehydes and Ketones > Reduction to Alcohol and Alkanes

Write a chemical equation to illustrate the following name reaction:

Benzoin condensation

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Aldehydes and Ketones > Benzoin Condensation

How will you bring about the following conversion? (Give equation).

Formaldehyde to urotropine

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Aldehydes and Ketones > Difference Between Formaldehyde and Acetaldehyde

Propanone on reaction with zinc amalgam in the presence of conc. HCI gives ______ and the reaction is known as ______ reduction.

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Aldehydes and Ketones > Reduction to Alcohol and Alkanes

Write a chemical equation to illustrate the following name reaction:

Aldol condensation.

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Aldehydes and Ketones > Base Catalysed Reactions

Write a chemical equation to illustrate the following name reaction:

Cannizzaro’s reaction.

Appears in 2 question papers
Chapter: [0.131] Carbonyl compounds
Concept: Aldehydes and Ketones > Base Catalysed Reactions

How will you obtain the following? (Give balanced equation.)

Ethyl chloride from diethyl ether.

Appears in 2 question papers
Chapter: [0.132] Ethers
Concept: Ethers > Physical and Chemical Properties of ether

What happens when benzene diazonium chloride reacts with phenol in the weak alkaline medium?
(Give a balanced equation).

Appears in 2 question papers
Chapter: [0.141] Carboxylic acids
Concept: Oxalic Acid > Substitution of Benzene Ring (Meta Directive Effect of Carboxylic Acid Group) Nitration and Sulphonation

Write a chemical equation to illustrate the following name reaction:

HVZ reaction

Appears in 2 question papers
Chapter: [0.141] Carboxylic acids
Concept: Acids > HVZ Reactions

Give a Reason for the Following:

For Ferric Hydroxide Sol. the Coagulating Power of Phosphate Ion is More than Chloride Ion.

Appears in 2 question papers
Chapter: [0.142] Acid derivatives
Concept: Acid Derivatives > Ethyl Acetate Reaction with Phosphorus Penta Chloride

Give an example of reducing sugar.

Appears in 2 question papers
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
Concept: Carbohydrates classification

What is denaturation of proteins?

Appears in 2 question papers
Chapter: [0.17] Biomolecules – carbohydrates, proteins, enzymes, vitamins and nucleic acids
Concept: Proteins > Denaturation of Proteins

Gas (A) is more soluble in water than Gas (B) at the same temperature. Which one of the two gases will have the higher value of KH (Henry’s constant) and why

Appears in 1 question paper
Chapter: [0.011000000000000001] Raoult's law and colligative properties
Concept: Solubility > Solubility of a Gas in a Liquid
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