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# Important Questions for CBSE (Science) Class 12 - CBSE - Chemistry

## Most repeated questions in exam

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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

How do you convert the Toluene to Benzoic acid

Appears in 10 question papers
Chapter: [12] Aldehydes, Ketones and Carboxylic Acids
Concept: Carboxylic Acids - Nomenclature

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

An element 'X' (At. mass = 40 g mol-1) having f.c.c. the structure has unit cell edge length of 400 pm. Calculate the density of 'X' and the number of unit cells in 4 g of 'X'. (NA = 6.022 × 1023 mol-1)

Appears in 9 question papers
Chapter: [1] Solid State
Concept: Number of Atoms in a Unit Cell

Calculate the freezing point of a solution containing 60 g of glucose (Molar mass = 180 g mol–1) in 250 g of water. (Kf of water = 1.86 K kg mol–1)

Appears in 9 question papers
Chapter: [2] Solutions
Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point

Give reasons for the following:

Measurement of osmotic pressure method is preferred for the determination of molar masses of macromolecules such as proteins and polymers.

Appears in 9 question papers
Chapter: [2] Solutions
Concept: Colligative Properties and Determination of Molar Mass - Depression of Freezing Point

Give reasons for the following :

Aquatic animals are more comfortable in the cold water than in warm water.

Appears in 9 question papers
Chapter: [2] Solutions
Concept: Solubility - Solubility of a Gas in a Liquid

Give reasons for the following

Elevation of the boiling point of 1 M KCl solution is nearly double than that of 1 M sugar solution.

Appears in 9 question papers
Chapter: [2] Solutions
Concept: Abnormal Molar Masses

Write the cell reaction and calculate the e.m.f of the following cell at 298 K:

Sn(s) | Sn^(2+) (0.004 M) || H^(+) (0.020 M) | H_2 (g) ("1 bar") | Pt(s)

(Given: E_(Sn^(2+)"/"Sn)^0 = -0.14 V)

Appears in 9 question papers
Chapter: [3] Electrochemistry
Concept: Galvanic Cells - Measurement of Electrode Potential

Give reasons On the basis of E° values, O2 gas should be liberated at anode but it is Cl2 gas which is liberated in the electrolysis of aqueous NaCl.

Appears in 9 question papers
Chapter: [3] Electrochemistry
Concept: Conductance of Electrolytic Solutions - Measurement of the Conductivity of Ionic Solutions

Give reasons Conductivity of CH3COOH decreases on dilution.

Appears in 9 question papers
Chapter: [3] Electrochemistry
Concept: Conductance of Electrolytic Solutions - Measurement of the Conductivity of Ionic Solutions

For the reaction

2AgCl (s) + H_2 (g) ("1 atm") -> 2Ag (s) + 2H^(+)  (0.1 M) +  2Cl^(-) (0.1 M)

triangleG^0 = -43600 J at 25^@ C

Calculate the e.m.f. of the cell

[log 10^(-n) = -n]

Appears in 9 question papers
Chapter: [3] Electrochemistry
Concept: Relation Between Gibbs Energy Change and Emf of a Cell

Write two advantages of fuel cell

Appears in 9 question papers
Chapter: [3] Electrochemistry
Concept: Fuel Cells

For the reaction

2N2O5 (g) → 4NO2 (g) + O2 (g), the rate of formation of NO2 (g) is 2·8 × 10–3 M s–1. Calculate the rate of disappearance of N2O5 (g).

Appears in 9 question papers
Chapter: [4] Chemical Kinetics
Concept: Rate of a Chemical Reaction

A first-order reaction is 50% completed in 40 minutes at 300 K and in 20 minutes at 320 K. Calculate the activation energy of the reaction. (Given : log 2 = 0·3010, log 4 = 0·6021, R = 8·314 JK–1 mol–1)

Appears in 9 question papers
Chapter: [4] Chemical Kinetics
Concept: Temperature Dependence of the Rate of a Reaction
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Important Questions for CBSE (Science) Class 12 CBSE Chemistry. You can further filter Question Answers by subjects and chapters. Chapter wise important Questions for Class 12 CBSE. it gets easy to find all Class 12 important questions with answers in a single place for students. Saving time and can then focus on their studies and practice. Important questions for Class 12 chapter wise with solutions
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