free webpage hit counter

Download in PDF; Check evaluation form and list of experiments

Download in PDF;  Check evaluation form and list of experiments

CBSE class 12 chemistry practice gives 30 points for the annual assessment. Students can easily achieve good grades in practice with regular practice and a conscious mind. Students must learn to identify different chemicals and to perform the experiments prescribed in the CBSE’s practical syllabus. We have here provided CBSE Class 12 Chemistry Practical Syllabus 2022-2023 for students to download in PDF. With this latest syllabus, students would become familiar with the practical evaluation scheme and the list of experiments for the current academic session. They should check the guidelines and instructions mentioned in the syllabus and prepare for the practical exam accordingly.

Check the CBSE Class 12 Chemistry Practical Curriculum 2022-2023 below:

3 HOURS / 30 MARKS

Examination evaluation scheme

Brands

Volumetric analysis

08

Salt analysis

08

Content-based experiment

06

Project work

04

Class record and viva

04

Total

30

PRACTICAL syllabus (60 periods)

Microchemical methods are available for several of the practical experiments. Where possible, such techniques should be used.

A. Surface Chemistry

(a) Preparation of a lyophilic and a lyophobic sol Lyophilic sol – starch, egg albumin and rubber Lyophobic sol – aluminum hydroxide, iron (III) hydroxide, arsenic sulphide.

(b) Dialysis of sol prepared in (a) above.

(c) Study of the role of emulsifiers in stabilizing the emulsion of different oils.

B. Chemical kinetics

(a) Effect of concentration and temperature on the reaction rate between sodium thiosulphate and hydrochloric acid.

(b) Study of reaction rates for 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 sulfite: (Na2SO3) by using starch solution as an indicator (clock reaction).

C. Thermochemistry

Any of the following experiments

  • Enthalpy of solution of copper sulphate or potassium nitrate.
  • (b) Enthalpy of neutralization of strong acid (HCl) and strong base (NaOH).
  • (c) Determination of entaply change during interaction (hydrogen bond formation) between acetone and chloroform.
  • Electrochemistry
  • Variation of cell potential in Zn / Zn2+|| Cu2+/ Cu with change in concentration of electrolytes (CuSO4 or ZnSO4) at room temperature.
See also  Are Mental Health Apps Really Worth Downloading?

E. Chromatography

(a) Separation of pigments from leaf and flower extracts by paper chromatography and determination of Rf values.

(b) Separation of constituents present in an inorganic mixture containing only two cations (constituents with large differences in Rf values ​​shall be provided).

F. Preparation of inorganic compounds

Preparation of double salt of ferrous ammonium sulphate or potassium alum. Preparation of potassium iron oxalate.

G. Preparation of organic compounds

Preparation of one of the following compounds

i) Acetanilide ii) Di-benzalAcetone iii) p-Nitroacetanilide iv) Anilingul or 2 – Naphthol Aniline dye.

H. Tests for functional groups in organic compounds:

Unsaturated, alcoholic, phenolic, aldehyde, ketonic, carboxylic and amino (primary) groups.

I. Characteristic tests of carbohydrates, fats and proteins in pure samples and their detection in given foods.

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+Eel3+ Fairy3+Mn2+Zn2+Nine2+About2+Sr.2+Ba2+Mg2+NH4+

Anions:

(CO3) 2-, S2-, (SO3) 2-, (NO2) -, (SO4) 2-, Cℓ-, Br-, I-, (PO4) 3-, (C2O4) 2-, CH3COO-, NO3 – (Note: Insoluble salts excluded)

SURVEY PROJECT

Scientific research involving laboratory testing and the collection of information from other sources. A few proposed projects.

  • Study of the presence of oxalates in guava fruit at different stages of ripening.
  • Study the amount of casein found in different milk samples.
  • Preparation of soybean milk and its comparison with natural milk in terms of curd formation, the effect of temperature, etc.
  • Study of the effect of potassium bisulfate as a food preservative under different conditions (temperature, concentration, time, etc.)
  • Study of digestion of starch by salivary amylase and the effect of pH and temperature on it.
  • Comparative study of the fermentation rate of the following materials: wheat flour, grammel, potato juice, carrot juice, etc.
  • Extraction of essential oils found in Saunf (anise), Ajwain (carum), Illaichi (cardamom).
  • Study of common food counterfeits in fat, oil, butter, sugar, turmeric, chili powder and pepper.
See also  Anywhere Real Estate : (opens in new window) Download PDF See all presentations

Note: Any other exploratory project, which involves approx. 10 periods of work, can be selected with the approval of the teacher. Practical exam for visually impaired students in class XI and XII evaluation form

General guidelines

  • The practical exam will be of two hours duration.
  • A separate list of ten experiments is included here.
  • Written exams in practice for these students will be completed at the time of practical exams for all other students.
  • The written test will have a duration of 30 minutes.
  • The question paper given to the students must be legibly typed. It will contain a total of 15 practical skills-based questions with very short answers. A student must answer 10 questions.
  • An author may be allowed to such students under CBSE exam rules.
  • All questions that are included in the questionnaires should be related to the practical listed. Each question should take approx. two minutes to be answered.
  • These students are also required to maintain a practical file. A student is expected to record at least five of the listed experiments according to the specific instructions for each course. These exercises should be checked and signed by an internal examiner.
  • The format for writing any experiment in the practical file should include goals, necessary equipment, simple theory, procedure, related practical skills, precautions, etc.
  • Questions can be generated jointly by external / internal sensors and used for assessment.
  • The Viva questions can include questions based on basic theory / principle / concept, devices / materials / chemicals required, procedure, precautions, sources of error, etc.

Elements for identification / knowledge of the apparatus for assessment in practice (all experiments)

See also  The Crypto app is downloaded when the market crashes

Beaker, glass rod, stand stand, wire mesh, Bunsen burner, Whatman filter paper, gas jar, capillary tube, beater and mortar, test tube, pliers, test tube holder, test tube stand, burette, pipette, conical flask, standard flask, clamp stand, funnel, filter paper

Hands-on assessment

  • Identification / knowledge of the device
  • Odor detection in qualitative analysis

2. List of practical exercises

The experiments are divided into two parts:

Section A and Section B.

The experiments mentioned in Part B are mandatory.

SECTION-A

A surface chemistry

1 Preparation of a lyophilic and a lyophobic sun – starch, egg albumin and gum

2 Preparation of a lyophobic sol-iron hydroxide

B Chromatography

Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rf values ​​(distance values ​​can be given).

C Tests for functional groups in organic compounds:

(1) Alcohol and carboxyl groups.

(2) Aldehyde and ketonic

D Characteristic tests of carbohydrates and proteins in the given foods.

E Preparation of inorganic compounds – Potash Alun

SECTION-B (required)

F Quantitative analysis

(1) (a) Preparation of the standard solution of oxalic acid of a given volume

(b) Determination of molarity of KMnO4 solution by titrating it against a standard solution of oxalic acid.

(2) The exercise above [F 1 (a) and (b)] to be carried out using ferrous ammonium sulphate (Mohrs salt)

G Qualitative analysis:

(1) Determination of one cation and one anion in a given salt.

Cation –NH4+

Anions – CO32- S2- SO32- Cl CH3COO

(Note: Insoluble salts excluded)

Note: The above practicals can be performed in an experiential way instead of recording observations.

Download the syllabus above in PDF from the following link:

CBSE class 12 chemistry practical syllabus 2022-2023: Download in PDF here

You may also like...

Leave a Reply

Your email address will not be published.