CLASS XII (SYLLABUS FOR SESSION 2021-22)
SUBJECT
:- CHEMISTRY PRACTICALS CODE 043
Term-I
MARKS :- 15
Term-I
Evaluation Scheme
|
S.NO |
PRACTICAL |
MARKS |
|
1 |
Volumetric Analysis |
4 |
|
2 |
Salt Analysis |
4 |
|
3 |
Content Based experiment |
2 |
|
4 |
Class record and viva(Internal
Examiner) |
5 |
TOTAL 15
(1) Volumetric analysis (4 marks) Determination of concentration/ molarity of KMnO4 solution 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).
(2)
Salt analysis (Qualitative analysis) (4 marks) Determination of one cation and
one anion in a given salt. Cations- Pb2+, Cu2+, As3+, Al3+, Fe3+, Mn2+, Ni2+,
Zn2+, Co2+, Ca2+, Sr2+, Ba2+, Mg2+, NH4 + Anions – (CO3) 2- , S2- , NO2 - , SO3
2- , SO4 2- , NO3 - , Cl- , Br- , I- , PO4 3- , C2O4 2- ,CH3COO- (Note:
Insoluble salts excluded)
(3) Content Based
Experiments (2 marks)
A. Chromatography i. Separation of pigments from extracts
of leaves and flowers by paper chromatography and determination of Rf values.
ii. Separation of constituents present in an
inorganic mixture containing two cations only (constituents having large
difference in Rf values to be provided).
B. Characteristic
tests of carbohydrates, fats and proteins in pure samples and their detection
in given foodstuffs.