CBSE Chemistry Practical Class 12

In CBSE Chemistry Practicals Class 12, students will learn the application of the theory topics by performing the CBSE Chemistry Practicals Class 12. Moreover, students are evaluated based on the CBSE Class 12 Chemistry Practicals. The marks obtained in the practical exam are added with theory to prepare the final score of the student. They can take the help of Chemistry Lab Manual Class 12 PDF to prepare for practical exams.

Students of Class 12 must concentrate on CBSE Chemistry Practical Class 12 as it holds a weightage of 30 marks. CBSE Class 12 Chemistry Practical consists of volumetric analysis for 8 marks and salt analysis for 8 marks, 6 marks for the content-based experiment, and 4 marks each for the project, class record and viva. Students must aim to get full marks by performing all the experiments and activities listed in the Chemistry Lab Manual Class 12. Doing so will help in increasing the overall scores of the students in the Class 12 board exam. To download the CBSE Syllabus for Class 12 Chemistry Practicals, click on the link below.

Download CBSE Class 12 Chemistry Practical Syllabus PDF 2023-24

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CBSE Class 12 Chemistry Practical Evaluation Scheme

Below you will find the CBSE Class 12 Chemistry practical evaluation scheme for students.

Topics  Marks
Volumetric Analysis 8
Salt Analysis 6
Content-Based Experiment 6
Project Work 4
Class record and viva 4
Total 30

CBSE Class 12 Chemistry Practical Experiments

Students should study the laws and theories from the Chemistry Lab Manual Class 12 before performing the experiments. Also, they are suggested to go through the practical notes before the practical exam. Chemistry Practicals CBSE Class 12 experiments are given here so that students can prepare for their practical examinations efficiently. They can find these experiments in Chemistry Lab Manual Class 12 in PDFs below.

Class 12 Chemistry Practical Experiments

A. Surface Chemistry
(a) Preparation of one lyophilic and one lyophobic sol

Lyophilic sol – starch, egg albumin and gum

Lyophobic sol – aluminium hydroxide, ferric hydroxide, arsenous sulphide.

(b) Dialysis of sol – prepared in (a) above.
(c) Study of the role of emulsifying agents in stabilising the emulsion of different oils.
B. Chemical Kinetics
(a) Effect of concentration and temperature on the rate of reaction between Sodium Thiosulphate and Hydrochloric acid.
(b) Study of reaction rates of any one of the following:
(i) Reaction of Iodide ion with Hydrogen Peroxide at room temperature using different concentrations of Iodide ions.
(ii) Reaction between Potassium Iodate (KIO3) and Sodium Sulphite: (Na2SO3) using starch solution as an indicator (clock reaction).
C. Thermochemistry
Any one of the following experiments
(a) Enthalpy of dissolution of Copper Sulphate or Potassium Nitrate.
(b) Enthalpy of neutralisation of strong acid (HCI) and strong base (NaOH).
(c) Determination of enthalpy change during interaction (Hydrogen bond formation) between Acetone and Chloroform.
D. Electrochemistry
Variation of cell potential in Zn/Zn2+|| Cu2+/Cu with change in concentration of electrolytes (CuSO4 or ZnSO4) at room temperature.
E. Chromatography
(a) Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rf values.
(b) Separation of constituents present in an inorganic mixture containing two cations only (constituents having a large difference in Rf values to be provided).
F. Preparation of inorganic compounds
Preparation of double salt of Ferrous Ammonium Sulphate or Potash Alum.

Preparation of Potassium Ferric Oxalate.

G. Preparation of organic compounds
Preparation of any one of the following compounds

i) Acetanilide ii) Di-benzalAcetone iii) p-Nitroacetanilide iv) Aniline Yellow or 2-Naphthol Aniline Dye.

H. Tests for the functional groups present in organic compounds:
Unsaturation, alcoholic, phenolic, aldehydic, ketonic, carboxylic and amino (Primary) groups.
I. Characteristic tests of carbohydrates, fats and proteins in pure samples and their detection in given foodstuffs.
J. Determination of concentration/molarity of KMnO4 solution by titrating it against a standard solution of:
(a) Oxalic acid

(b) Ferrous Ammonium Sulphate

(Students will be required to prepare standard solutions by weighing themselves).

K. Qualitative analysis
Determination of one anion and one cation in a given salt
Cation:

Pb2+, Cu2+ As3+, Aℓ3+, Fe3+, Mn2+, Zn2+, Ni2+, Ca2+, Sr2+, Ba2+, Mg2+, NH2+

Anions:

(CO3)2-, S2-, (SO3)2-, (NO2), (SO4)2-, Cℓ, Br, I, (PO4)3-, (C2O4)2-, CH3COO , NO3

(Note: Insoluble salts excluded)

Also Check: CBSE Class 12 Chemistry Viva Questions

CBSE Chemistry Lab Manual Class 12 Projects

A few suggested Projects for CBSE Chemistry Lab Manual Class 12 are mentioned below:

  • Study of the presence of oxalate ions in guava fruit at different stages of ripening.
  • Study of quantity of casein present in different samples of milk.
  • Preparation of soybean milk and its comparison with natural milk with respect to curd formation, the effect of temperature, etc.
  • Study of the effect of Potassium Bisulphate as a food preservative under various conditions (temperature, concentration, time, etc.).
  • Study of digestion of starch by salivary amylase and effect of pH and temperature on it.
  • Comparative study of the rate of fermentation of the following materials: wheat flour, gram flour, potato juice, carrot juice, etc.
  • Extraction of essential oils present in Saunf (aniseed), Ajwain (carum), and Illaichi (cardamom).
  • Study of common food adulterants in fat, oil, butter, sugar, turmeric powder, chilli powder and pepper.

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