Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 12
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Important Questions for PUC Karnataka Science Class 12 - Department of Pre-University Education, Karnataka - Chemistry

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Draw the structures of the following molecules: XeF4

Appears in 23 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements > Concept of Group 18 Elements

Define terms: Fuel cell

Appears in 13 question papers
Chapter: [3] Electrochemistry
Concept: Batteries > Primary Batteries

Write the chemical equations involved in the following reactions:(i) Hoffmann-bromamide degradation reaction

Appears in 12 question papers
Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines > Preparation of Amines

Amino acids show amphoteric behaviour. Why?

Appears in 11 question papers
Chapter: [14] Biomolecules
Concept: Proteins > Amino Acids

Illustrate the following reaction giving suitable example in each case:Gabriel phthalimide synthesis

Appears in 10 question papers
Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Amines > Preparation of Amines

Define the following terms: Essential amino acids

Appears in 10 question papers
Chapter: [14] Biomolecules
Concept: Proteins > Amino Acids

Why is bithional added to soap?

Appears in 10 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Cleansing Agents - Soaps

What happens when: XeF4 reacts with SbF5?

Appears in 9 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 18 Elements > Concept of Group 18 Elements

Write the formulas for the following coordination compounds:

Iron(III) hexacyanoferrate(II)

Appears in 9 question papers
Chapter: [9] Coordination Compounds
Concept: Introduction of Coordination Compounds

Illustrate the following reaction giving suitable example in each case: Diazotisation

 

Appears in 9 question papers
Chapter: [13] Organic Compounds Containing Nitrogen
Concept: Diazonium Salts > Method of Preparation of Diazonium Salts

What is tincture of iodine? What is its use?

Appears in 9 question papers
Chapter: [16] Chemistry in Everyday Life
Concept: Therapeutic Action of Different Classes of Drugs - Antimicrobials

How would you account for the following: Transition metals form complex compounds.

Appears in 7 question papers
Chapter: [8] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)

The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume :

SO2Cl2 (g) → SO2 (g) + Cl2 (g)

Experiment Time/s–1 Total pressure/atm
1 0 0.4
2 100 0.7

Calculate the rate constant.

(Given : log 4 = 0.6021, log 2 = 0.3010)

Appears in 6 question papers
Chapter: [4] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

Account for the following : Nitrogen does not form pentahalide.

Appears in 6 question papers
Chapter: [7] P - Block Elements
Concept: P - Block Group 15 Elements > Dinitrogen

Give reasons: Transition metals show variable oxidation states.

Appears in 6 question papers
Chapter: [8] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)

Complete the following equation : MnO4- + 8H+ + 5e- →

Appears in 6 question papers
Chapter: [8] "D" and "F" Block Elements
Concept: Some Important Compounds of Transition Elements - Oxides and Oxoanions of Metals

Write the equations involved in the following reactions : Reimer – Tiemann reaction

Appears in 6 question papers
Chapter: [11] Alcohols, Phenols and Ethers
Concept: Chemical Reactions of Phenols (Only)

Give simple chemical tests to distinguish between the following pairs of compounds

Propanal and Propanone

Appears in 6 question papers
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones > Chemical Reactions of Aldehydes and Ketones - Oxidation

State Henry’s law.

Appears in 5 question papers
Chapter: [2] Solutions
Concept: Solubility > Solubility of a Gas in a Liquid

Name the method of refining of metals such as Germanium.

Appears in 5 question papers
Chapter: [6] General Principles and Processes of Isolation of Elements
Concept: Refining
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