CBSE Class 12 Chemistry Solutions Board Exam Notes

Download the latest CBSE Class 12 Chemistry Solutions Board Exam Notes in PDF format. These Class 12 Chemistry revision notes are carefully designed by expert teachers to align with the 2025-26 syllabus. These notes are great daily learning and last minute exam preparation and they simplify complex topics and highlight important definitions for Class 12 students.

Chapter-wise Revision Notes for Class 12 Chemistry Unit 1 Solutions

To secure a higher rank, students should use these Class 12 Chemistry Unit 1 Solutions notes for quick learning of important concepts. These exam-oriented summaries focus on difficult topics and high-weightage sections helpful in school tests and final examinations.

Unit 1 Solutions Revision Notes for Class 12 Chemistry

 

SOLUTION is the homogeneous mixture of two or more than two components. Most of the solutions are binary i.e. consists of two components out of which that is present in the largest quantity is called solvent & one which is present in smaller quantity called solute.
 
EXPRESSING CONCENTRATIONS OF SOLUTIONS
 
¶ Mass percentage: Mass of solute per 100g of solution Mass % = (mass of solute / total mass of solution) X 100
¶  Volume percentage : volume of solute per 100ml of solution Volume % = (volume of solute/ total volume of solution) X 100
 
¶  Parts per million: parts of a component per million (106) parts of the solution.
ppm = no. o f parts of the component / total no. of parts of all components of the sol. X 106
¶  Mole fraction(x): It is the ratio of no. of moles of one component to the total no. of all the components present in the solution . For binary solution :‐ the no. of moles of A and B are nA and nB respectively
so, xA= nA/nA+nB ; xB= nB/ nA+nB
In binary solution xA+ xB= 1
¶  Molarity: No. of moles of solute dissolved in one litre of solution .
Molarity(M) = moles of solute/ vol. of solution in litre
¶  Molality(m) : No. of moles of solute per kg of the solvent.
Molality(m) = moles of solute/mass of solvent in kg
Molality is independent of temp. whereas molarity is a function of temp. because vol. depends on temp. and mass does not.
 
HENRY'S LAW
 
It states that at a constant temp. the solubility of the gas in liquid is directly proportional to the pressure of the gas above the surface of the liquid .
It also states that the partial pressure (p) of a gas in vapour phase is proportional to the mole fraction of the gas (x) in the solution.
P=KHX
KH is Henry's law constant .
 
APPLICATION OF HENRY'S LAW
 
¶  To increase the solubility of CO2 in soda water and soft drinks the bottle is sealed under high pressure.
¶  To avoid bends , toxic effects of high concentration of nitrogen in the blood the tanks used Used by scuba divers are filled with air diluted with He.
 
RAOULT'S LAW :‐ it states that :
1) For a solution of volatile liquid , the partial vapour pressure of each component of the solution is directly proportional to its mole fraction present in solution.
PA= P0
A XA PB= P0B XB
The total pressure is equal to sum of partial pressure. Ptotal= PA+ PB
2) For a solution containing non‐volatile solute the vapour pressure of the solution is directly proportional to the mole fraction of the solvent.
 
 
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CBSE Class 12 Chemistry Unit 1 Solutions Notes

Students can use these Revision Notes for Unit 1 Solutions to quickly understand all the main concepts. This study material has been prepared as per the latest CBSE syllabus for Class 12. Our teachers always suggest that Class 12 students read these notes regularly as they are focused on the most important topics that usually appear in school tests and final exams.

NCERT Based Unit 1 Solutions Summary

Our expert team has used the official NCERT book for Class 12 Chemistry to design these notes. These are the notes that definitely you for your current academic year. After reading the chapter summary, you should also refer to our NCERT solutions for Class 12. Always compare your understanding with our teacher prepared answers as they will help you build a very strong base in Chemistry.

Unit 1 Solutions Complete Revision and Practice

To prepare very well for y our exams, students should also solve the MCQ questions and practice worksheets provided on this page. These extra solved questions will help you to check if you have understood all the concepts of Unit 1 Solutions. All study material on studiestoday.com is free and updated according to the latest Chemistry exam patterns. Using these revision notes daily will help you feel more confident and get better marks in your exams.

Where can I download the latest PDF for CBSE Class 12 Chemistry Solutions Board Exam Notes?

You can download the teacher prepared revision notes for CBSE Class 12 Chemistry Solutions Board Exam Notes from StudiesToday.com. These notes are designed as per 2025-26 academic session to help Class 12 students get the best study material for Chemistry.

Are these Chemistry notes for Class 12 based on the 2026 board exam pattern?

Yes, our CBSE Class 12 Chemistry Solutions Board Exam Notes include 50% competency-based questions with focus on core logic, keyword definitions, and the practical application of Chemistry principles which is important for getting more marks in 2026 CBSE exams.

Do these Class 12 notes cover all topic-wise concepts for Chemistry?

Yes, our CBSE Class 12 Chemistry Solutions Board Exam Notes provide a detailed, topic wise breakdown of the chapter. Fundamental definitions, complex numerical formulas and all topics of CBSE syllabus in Class 12 is covered.

How can I use CBSE Class 12 Chemistry Solutions Board Exam Notes for quick last-minute revision?

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