Description

NIOS CHEMISTRY 313 PRACTICAL MANUAL HELP BOOK IN ENGLISH MEDIUM

Here We Provide NIOS Practical Lab Manual & Practical Examination Guidelines for 12th Class with important Experiments, Marking Scheme.

Guidelines for Nios (313) Chemistry Practical Examination Senior Secondary Level

Duration : 3 hours              There will be a practical examination of 20 marks apart from the theory examination.

The distribution of 20 marks is as follows:

Experiments                                                                                      Marks

Salt Analysis (one cation + one anion)                                        4

Volumetric Analysis                                                                         6
(i) write-up in which student may be asked
to write brief method, indicator, equation, end point.              2

(ii) Set-up of experiment                                                                  2

(iii) Results                                                                                          2

(a) Detection of elements in an organic compound                    2

(b) Detection of functional group                                                   2

OR

Setting up of one experiment from experiments at serial
number 2 to 10, 12 and 13. 4

Viva-voce                                                                                               3

Record book                                                                                          3

Total Marks                                                                                         20

List of Practical works :

1. To cut a Glass tube of desired length.
2. Explain the meaning of the terms saturated solution, standard solution and dilution, use proper glassware to prepare solutions of different dilutions, prepare solutions of given concentrations by dilution.
3. To prepare a sol of starch, prepare a sol of ferric hydroxide and explain the properties of sol of aluminium hydroxide, starch and ferric hydroxide.
4. Define enthalpy of neutralization, classify various acids and bases as strong or weak acids and base, observe changes in temperature during neutralization of an with an base, explain the significance of enthalpy of neutralization.
5. Perform dilution of the solutions using measuring cylinder, compare the intensity of colours in two solutions visually, predict the direction in which the equilibrium will shift if the concentration of any reactant is increased or decreased, predict the direction in which the equilibrium will shift, if concentration of any product is increased or decreased.
6. Observe the effect of concentration of reactants on rates of reactions, predict the effect of concentration of reactants on rates of reactions, observe the effect of temperature on rates of reactions, predict the effect of temperature on rates of reactions.
7. Prepare iodoform, prepare acetanilide, explain the variuos synthetic steps involved in the preparation of iodoform and acetanilide, observe the chemical changes during the preparation of iodoform and acetanilide and explain the synthentic importance and properties of iodoform and acetanilide.
8. Separate the various constituents of inks, juice of a flower and or grass, and calculate the R, values of the various components of a mixture.
9. Test the presence of carbohydrates, proteins and fats in the given food samples, establish whether the given carbohydrate is reducing or non reducing. Distinguish between saturated and unsaturated fats.
10. Handle chemical balance properly, weigh chemicals accurately using a chemical balance, handle burette and pipette properly, pipette out a given solution correctly with the help of a pipette, prepare standard solutions of oxidalic acid and ferrous ammonium sulphate, detect the sharp end point, perform acid base (Oxalic acid and sodium hydroxide) and redox (ferrous ammonium sulphate and potassium permanganate ) titrations, calculate the Molarity and strenght of the given solution by using appropriate formula.
11. Explain the meaning of Qualitative Analysis, Handle properly the chemicals and regent bottles in the chemistry laboratory, Perform simple experimental operations such as heating, testing of gas evolved, filtration and washing or residue etc. observe the appearance / disappearance of colour, precipitate, turbidity etc. in reaction mizture, acquire an elementary idea of the presence of an anion or cation in the salt by carrying out dry test and perform preliminary and confirmatory test of anions and cations and analyses the given salt.