In this article we are providing the precise solutions to all the NCERT Exemplar Problems of class 12 Chemistry chapter- Solutions. Our experts have solved all the questions in detail but simple language.
Importance of NCERT Exemplar Class 12th Chemistry:
Analysis of previous year CBSE Class 12 chemistry question paper shows that some questions are directly asked from Class 12 Chemistry NCERT exemplar book with little modifications. Also these questions are frequently asked in the engineering entrance exams. Therefore, it’s quite essential for students to practice the NCERT Exemplar questions and try to get the appropriate answers to all of them.
NCERT exemplar solutions given here are a perfect preparation tool to prepare well for the board exams and other ntrance tests. All the solutions are available in the PDF format.
Few problems along with their solutions from this chapter are given follows:
Q. On dissolving sugar in water at room temperature solution feels cool to touch. Under which of the following cases dissolution of sugar will be most rapid?
(a) Sugar crystals in cold water
(b) Sugar crystals in hot water
(c) Powdered sugar in cold water
(d) Powdered sugar in hot water
Ans. (d) Powdered sugar in hot water
Dissolution of sugar in water will be most rapid when powdered sugar is dissolved in hot water because powder form can easily insert in the vacancies of liquid particles. Further dissolution of sugar in water is an endothermic process. Hence, high temperature will favour the dissolution of sugar in water.
Q. On the basis of information given below mark the correct option.
Information: On adding acetone to methanol some of the hydrogen bonds between methanol molecules break.
(a) At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult's law
(b) At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show positive deviation from Raoult's law
(c) At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show negative deviation from Raoult's law
(d) At specific composition methanol-acetone mixture will form maximum boiling azeotrope and will show negative deviation from Raoult's law
Ans. (a) At specific composition methanol-acetone mixture will form minimum boiling azeotrope and will show positive deviation from Raoult's law
At specific composition methanol- acetone mixture will form minimum boiling azeotrope and will show positive deviation. This is due to weaker A—B interaction than A—A or B—B interaction. i.e., A—B < A—A and B—B
CBSE Class 12 Chemistry Syllabus 2018 – 2019
Q. Concentration terms such as mass percentage, ppm, mole fraction and molality are independent of temperature. However molarity is a function of temperature. Explain.
Ans. Molarity is defined as the number of moles of solute dissolved per litre of a solution. Since, volume depends on temperature and changes with change in temperature, the molarity will also change with change in temperature.
On the other hand, mass does not change with change in temperature, so other concentration terms given in the question also do not do so. Thus, temperature has no effect on the mass but it has significant effect on volume.
Find below the links to download Class 12 Chemistry NCERT Exemplar Solutions for chapter 2- Solutions:
| Questions |
Link to Download PDF |
| Multiple Choice Questions (Type-I) |
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| Multiple Choice Questions (Type-II) |
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| Short Answer Type Questions |
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| Matching Columns Type Questions |
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| Assertion and Reason Type Questions |
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| Long answer types questions |
Class 12 Chemistry NCERT Solutions: All Chapters
Class 12 Chemistry NCERT Exemplar Problems:
NCERT Exemplar book for class 12 Biology consists of a collection of conceptual questions which are designed purely to check a student’s understanding about the various concepts and theories explained in the subject. These problems form the best practice source to prepare effectively for board exams and the medical entrance tests.
Here, we are providing the NCERT Exemplar Problems for Class 12 Chemistry chapter - Solutions, in the PDF form which students may download and solve them to analyse their preparedness for the exams.
Important topics discussed in Class 12 Chemistry chapter – Solutions, are:
- Types of Solutions
- Expressing Concentration of Solutions
- Solubility
- Solubility of a Solid in a Liquid
- Solubility of a Gas in a Liquid
- Vapour Pressure of Liquid Solutions
- Vapour Pressure of Liquid-Liquid Solutions
- Raoult’s Law as a special case of Henry’s Law
- Vapour Pressure of Solutions of Solids in Liquids
- Ideal and Nonideal Solutions
- Ideal Solutions
- Non-ideal Solutions
- Colligative Properties and Determination of Molar Mass
- Relative Lowering of Vapour Pressure
- Elevation of Boiling Point
- Depression of Freezing Point
- Osmosis and Osmotic Pressure
- Abnormal Molar Masses
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