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Give reason Aromatic diazonium salts are more stable than aliphatic diazonium salts.
Concept: Physical Properties of Diazonium Salts
Write the structures of the main products of the following reactions:
Concept: Amines > Chemical Reactions of Amines - Basic Character of Amines
Write the structures of the main products of the following reactions:
Concept: Amines > Chemical Reactions of Amines - Basic Character of Amines
Write the structures of the main products of the following reactions:
Concept: Amines > Chemical Reactions of Amines - Basic Character of Amines
Define the following with an example of each
Polysaccharides
Concept: Carbohydrates > Polysaccharides - Starch, Cellulose and Glycogen
Define the following with an example
Denatured protein
Concept: Proteins > Denaturation of Proteins
Write the product when D-glucose reacts with conc. HNO3.
Concept: Carbohydrates > Structures of Glucose
Write one difference between α-helix and β-pleated structures of proteins.
Concept: Proteins > Structure of Proteins
Shyam went to a grocery shop to purchase some food items. The shopkeeper packed all the items in polythene bags and gave them to Shyam. But Shyam refused to accept the polythene bags and asked the shopkeeper to pack the items in paper bags. He informed the shopkeeper about the heavy penalty imposed by the government for using polythene bags. The shopkeeper promised that he would use paper bags in future in place of polythene bags.
1) Write the values (at least two) shown by Shyam.
2) Write one structural difference between low-density polyethene and high-density polyethene.
3) Why did Shyam refuse to accept the items in polythene bags?
4) What is a biodegradable polymer? Give an example.
Concept: Introduction to Polymers > Classification of Polymers Based on Mode of Polymerisation
What is tincture of iodine? What is its use?
Concept: Therapeutic Action of Different Classes of Drugs - Antimicrobials
Among the following, which one acts as a food preservative?
Aspartame, Aspirin, Sodium Benzoate, Paracetamol
Concept: Chemicals in Food - Artificial Sweetening Agents and Food Preservatives
How do you convert the following:
Aniline to phenol
Concept: Methods of Preparation of Phenols
How do you convert the Ethanal to Propanone
Concept: Alcohols, Phenols and Ethers > Nomenclature
When concentrated sulphuric acid was added to an unknown salt present in a test tube a brown gas (A) was evolved. This gas intensified when copper turnings were added to this test tube. On cooling, the gas (A) changed into a colourless solid (B).
1) Identify (A) and (B).
2) Write the structures of (A) and (B).
3) Why does gas (A) change to solid on cooling?
Concept: P - Block Group 16 Elements > Sulphuric Acid
Arrange the following in the decreasing order of their reducing character :
HF, HCl, HBr, HI
Concept: Concept of Group 17 Elements
Account for the following:
pKa value of 4-nitrobenzoic acid is lower than that of benzoic acid.
Concept: Physical Properties of Carboxylic Acids
Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline
Concept: Amines > Chemical Reactions of Amines - Carbylamine Reaction
State Faraday's first law of electrolysis.
Concept: Faraday’s Law of Induction
How would you account for the following: Transition metals form complex compounds.
Concept: General Properties of the Transition Elements (D-block)
Account for the following:
E° value for the Mn3+/Mn2+ couple is much more positive than that for Cr3+/Cr2+.
Concept: General Properties of the Transition Elements (D-block)
