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Chemistry Practicals Syllabus 2010 - CBSE Class XII

 


Practicals

Evaluation Scheme for Examination Marks
Volumetric Analysis

Salt Analysis

Content Based Experiment

Class record and viva

Investigatory Project

10

6

4

5

5

Total 30

Practicals Syllabus

A. Surface Chemistry.

  1. Preparation of one lyophilic and one lyophobic sol.

    Lyophilic sol - starch, egg albumin and gum

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

  2. Study of the role of emulsifying agents in stabilizing the emulsions of different oils.
B. Chemical Kinetics
  1. Effect of concentration and temperature on the rate of reaction between sodium thiosulphate and hydrochloric acid.
  2. Study of reaction rates of any one of the following:

    (i) Reaction of iodide ion with hydrogen peroxide at room temperature

    using different concentration of iodide ions.

    (ii) Reaction between potassium iodate, KIO3 and sodium sulphite: (Na2SO3) using starch solution as indicator (clock reaction).

C. Thermochemistry
Any one of the following experiments
 
i) Enthalpy of dissolution of copper sulphate or potassium nitrate.
 
ii) Enthalpy of neutralization of strong acid (HC1) and strong base (NaOH)
 
iii) 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 (CuSO4or ZnSO4) at room temperature.

E. Chromatography

i) Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rfvalues.
 
ii) Separation of constituents present in an inorganic mixture containing two cations only (constituents having large difference in Rfvalues to be provided).

F. Preparation of Inorganic Compounds

i) Preparation of double salt of ferrous ammonium sulphate or potash alum.
 
ii) Preparation of potassium ferric oxalate.

G. Preparation of Organic Compounds

Preparation of any two of the following compounds
 
i) Acetanilide
ii) Di-benzal acetone
iii) p-Nitroacetanilide.
 
iv) Aniline yellow or 2 - Napthol aniline dye.
 
v) Iodoform

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 food stuffs.

J. Determination of concentration/molarity of KMnO4solution by titrating it against a standard solution of:
 
i) Oxalic acid,
 
ii) Ferrous ammonium sulphate
 
(Students will be required to prepare standard solutions by weighing themselves).

K. Qualitative analysis

-Determination of one cation and one anion in a given salt.
 
Cations- Pb2+, Cu2+, As3+A13+Fe3+Mn2+, Ni2+, Zn2+, Co2+Ca2+, Sr2+, Ba2+, Mg2+, NH4+
Anions- CO32-, S2-, SO32-, SO42-, NO2-, NO3-, Cl-, Br-, I-, PO43-, C2O42-, CH3COO-
(Note: Insoluble salts excluded)
PROJECT
Scientific investigations involving laboratory testing and collecting information from other sources.

A few suggested Projects.
 
  • Study of 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 the natural milk with respect to curd formation, effect of temperature, etc.
  • Study of the effect of potassium bisulphate as 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 following materials: wheat flour, gram flour, potato juice, carrot juice etc.
  • Extraction of essential oils present in Saunf (aniseed), Ajwain (carum), Illaichi (cardamom).
  • Study of common food adulterants in fat, oil, butter, sugar, turmeric powder, chilli powder and pepper.
 
Note: Any investigatory project, which involves about 10 periods of work, can be chosen with the approval of the teacher.

Recommended Textbooks

.
1. Chemistry Part - I, Published by NCERT
2. Chemistry Part - II, Published by NCERT

 

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