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

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Draw the structures of the following molecules: XeF4

Appears in 23 question papers
Chapter: [0.07] P - Block Elements
Concept: P - Block Group 18 Elements > Concept of Group 18 Elements

Define terms: Fuel cell

Appears in 13 question papers
Chapter: [0.03] 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: [0.13] Organic Compounds Containing Nitrogen
Concept: Amines > Preparation of Amines

Amino acids show amphoteric behaviour. Why?

Appears in 11 question papers
Chapter: [0.14] Biomolecules
Concept: Proteins > Amino Acids

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

Appears in 10 question papers
Chapter: [0.13] Organic Compounds Containing Nitrogen
Concept: Amines > Preparation of Amines

Define the following terms: Essential amino acids

Appears in 10 question papers
Chapter: [0.14] Biomolecules
Concept: Proteins > Amino Acids

Why is bithional added to soap?

Appears in 10 question papers
Chapter: [0.16] Chemistry in Everyday Life
Concept: Cleansing Agents - Soaps

What happens when: XeF4 reacts with SbF5?

Appears in 9 question papers
Chapter: [0.07] 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: [0.09] Coordination Compounds
Concept: Introduction of Coordination Compounds

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

 

Appears in 9 question papers
Chapter: [0.13] 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: [0.16] Chemistry in Everyday Life
Concept: Therapeutic Action of Different Classes of Drugs - Antimicrobials

Define the term 'conductivity' of a metallic wire. Write its SI unit.

Appears in 9 question papers
Chapter: [0.03] Current Electricity
Concept: Electrical Resistivity and Conductivity

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

Appears in 7 question papers
Chapter: [0.08] "D" and "F" Block Elements
Concept: General Properties of the Transition Elements (D-block)

Find the distance of the point (−1, −5, −10) from the point of intersection of the line `vecr=2hati-hatj+2hatk+lambda(3hati+4hatj+2hatk) ` and the plane `vec r (hati-hatj+hatk)=5`

Appears in 7 question papers
Chapter: [0.11] Three - Dimensional Geometry
Concept: Three - Dimensional Geometry Examples and Solutions

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: [0.04] Chemical Kinetics
Concept: Factors Influencing Rate of a Reaction

Account for the following : Nitrogen does not form pentahalide.

Appears in 6 question papers
Chapter: [0.07] P - Block Elements
Concept: p-Block elements of Group 15 Elements > Dinitrogen

Give reasons: Transition metals show variable oxidation states.

Appears in 6 question papers
Chapter: [0.08] "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: [0.08] "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: [0.11] Alcohols, Phenols and Ethers
Concept: Chemical Properties of Phenol

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

Propanal and Propanone

Appears in 6 question papers
Chapter: [0.12] Aldehydes, Ketones and Carboxylic Acids
Concept: Aldehydes and Ketones > Chemical Reactions of Aldehydes and Ketones - Oxidation
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