To Prepare Colloidal Solution (or sol) of Egg Albumin Theory Egg albumin which is obtained from eggs forms lyophilic sol with cold water. The sol is quite stable and is not affected by the presence of traces of impurities.Apparatus Beakers (250 ml and 50 ml), glass rod, funnel, filter-paper, pestle and mortar, tripod stand, wire-gauze and burner.Materials … [Read more...]

Preparation of 250 ml of M/20  Solution of Mohr’s Salt  TheoryApparatus Watch glass, weight box, fractional weight box, 250 ml beaker, glass rod, 250 ml measuring flask and wash bottle.Chemical Required Mohr’s salt, cone. H2SO4  and distilled water.ProcedureWeigh the clean and dry watch glass and record its weight in the note-book. Weigh accurately 4.9 … [Read more...]

To Prepare a Colloidal Solution of Gum Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample PapersTheory Starch forms a lyophilic sol when water is used as the dispersion medium. The formation of sol is accelerated by heating. The starch sol can be prepared by heating starch and water at about 100°C. It is quite stable and is not affected by the presence of any … [Read more...]

Tests of Carbohydrates, Fats and Proteins in Pure Samples and Detection of Their Presence in Given Food Stuffs Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample PapersFood is a necessary material which must be supplied to the body for its normal and proper functioning. The main functions of the food are: 1. to provide energy 2. to promote growth 3. to … [Read more...]

To Prepare Colloidal Solution (sol) of Starch Theory Starch forms a lyophilic sol when water is used as the dispersion medium. The formation of sol is accelerated by heating. The starch sol can be prepared by heating starch and water at about 100°C. It is quite stable and is not affected by the presence of any electrolytic impurity.Apparatus Beakers (250 ml and 50 ml), … [Read more...]

Chemistry Practicals Class 12 Surface Chemistry Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample PapersThomas Graham (1861) studied the process of diffusion of dissolved substances through a parchment paper or an animal membrane. He divided substances into two classes: (i) crystal-loids and (ii) colloids. Substances like sugar, urea, common salt, etc. which … [Read more...]

Prepare 250 ml of a N/10 Solution of Oxalic Acid from Crystalline Oxalic Acid Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample PapersTheoryApparatus Watch glass, analytical balance, weight box, fractional weight box, 250 ml beaker, glass rod, 250 ml measuring flask and wash bottle.Chemical Required Oxalic acid crystals and distilled … [Read more...]

Determine the Equivalent Mass and Number of Molecules of Water of Crystallisation in a Sample of Mohr’s salt, FeSO4(NH4)2 SO4 . nH20. Provided KMnO4 Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample PapersChemical EquationsTheory Prepare a solution of Mohr’s salt with known strength (g/litre). Molarity of ferrous ammonium sulphate can be determined by … [Read more...]

Chemistry Practicals Class 12 Viva Questions with Answers Question.1. Why is a Bunsen burner provided with air holes? Answer. To regulate the supply of air.Question.2. What type of flame would you use for general heating purpose? Answer. A non-luminous oxidising flame as it gives maximum heat due to complete combustion of hydrocarbons.Question. 3. What is the use … [Read more...]

Chemistry Practical Class 12 Chromatography Chemistry Lab ManualNCERT Solutions Class 12 Chemistry Sample PapersChromatography is a modem and sensitive technique used for rapid and efficient analysis and (or) separation of components of a mixture and purification of compounds. The basic principle of chromatographic technique is based on the differential migration of the … [Read more...]