CBSE Class 12-science Answered

Hi,

Unit 4: Chemical Kinetics (Marks approx: 5)

• Rate of Reaction (Average Rate and Instantaneous Rate)
• Factors Influencing Rate of a Reaction (Concentration, Temperature, Catalyst) - (Important)
• Order and Molecuarity of a Reaction (Zero Order, First Order, Second Order)
• Rate Law and Specific Rate Constant
• Integrated Rate Equations (Only for Zero and First Order Reactions)
• Half-Life of a Reaction (Important)
• Pseudo First Order Reaction
• Temperature Dependence of the Rate of a Reaction
• Effect of Catalyst (Very Important)
• Concept of Collision Theory
• Arrhenius Equation
• Activation Energy

Unit 5: Surface Chemistry (Marks approx: 4)

• Distinction between two things (such as lyophillic and lyophobic, physical absorption and chemical absorption, Enzymes and catalyst).
• Tyndall effect, Brownian movement, electrophoresis, coagulation, emulsion - types of emulsions.

Chapter 12: Aldehydes, Ketones and Carboxylic Acids (Marks approx: 6)

• Aldehydes and Ketones: Nomenclature and Structure of Carbonlyl Group, Methods of  preparation – Gatterman-Koch Reaction (Important), Chemical properties, Mechanism of Nucleophilic Addition, Nucleophilic Addition and Nucleophilic Addition-Elimination Reactions (Important), Reactivity of alpha hydrogen in aldehydes (Important)
• Carboxylic Acids: Nomenclature, acidic nature, Methods of Preparation of Carboxylic Acids (Very Important), All Chemical Properties and Reactions (Important)

Attempting Numericals: (All the Numerical problems are important from chemical kinetics and surface chemistry)

• Do not ignore numerical problems as most of the times, the problems are direct application of the formulae mixed with the understanding of a topic. Mastering numerical problems is a good way to score marks.
• Start the answer by writing the skeleton formula in standard notation followed by substitution of values with units.
• Conversion of units should be taken care of. The final answer must be written with units.
• Numericals carry step-wise marking. At times it happens that due to lack of time these questions remain un-attempted. In that case, even if you write the general formula and substitute the values, you manage to score some of the total marks allotted to the question.

All the Best!!