Class 12 chemistry viva voce question and answers are concept focused and not question focused, which improves the conceptual knowledge based on the practicals performed by the students. Students can revise each and every chapter viva voce questions by referring to the question answers provided and obtain a confidence on them.
A general viva voce is based on the practicals. Prepare accordingly from the set of viva voce given after each experiment. Class 12 Chemistry Practicals Viva Voce Question and Answers is to judge whether the student has merely copied the experiments from the book or he/she has actually performed it in the laboratory. Also this helps to remember about the experiments performed in the laboratory. Keep revising.
Class 12 Chemistry Viva Questions With Answers
A. Surface Chemistry
- Preparation of one lyophilic and one lyophobic sol.
- Lyophilic sol: starch, egg albumin and gum.
- Lyophobic sol: aluminium hydroxide, ferric hydroxide, arsenious sulphide.
- Dialysis of sol prepared in (1) above.
- Study of the role of emulsifying agents in stabilising the emulsions of different oils.
B. Chemical Kinetics
Study of reaction rates of any one of the following:
- Reaction of iodide ion with hydrogen peroxide at room temperature using different concentrations of iodide ions.
- Reaction between potassium iodate (KIO3 ) and sodium sulphite (Na2SO3) using starch solution as indicator (clock reaction).
C. Thermochemistry
Any one of the following experiments:
- Enthalpy of dissolution of copper sulphate or potassium nitrate.
- Enthalpy of neutralisation of strong acid (HCl) and strong base (NaOH)
- Determination of enthalpy change during interaction (Hydrogen bond formation) between acetone and chloroform.
D. Electrochemistry
E. Chromatography
- Separation of pigments from extracts of leaves and flowers by paper chromatography and determination of Rf values.
- Separation of constituents present in an inorganic mixture containing two cations only (constituents having wide difference in Rf values to be provided).
F. Preparation of Inorganic Compounds
- Preparation of double salt of ferrous ammonium sulphate or potash alum.
- Preparation of potassium ferric oxalate.
G. Preparation of Organic Compounds
Preparation of any one of the following compounds:
H. Test for the Functional Groups Present in Organic Compounds
I. Characteristic Tests
J. Determination of Concentration/Molarity of KMnO4 Solution by Titrating it against a Standard Solution of –
K. Qualitative Analysis
Determination of one cation and one anion in a given salt.
Students will gain a better understanding of the concept by doing the experiments since they will be able to see the changes taking place right in front of their eyes. Their fundamentals will become strong as they learn by doing. They will also develop an interest in the subject as a result of this practice.
Also Check more on:
- Important Questions for Class 12 Chemistry
- Important Questions for Class 11 Chemistry
- Marks-Wise Important Questions for Chemistry
- Class 12 Chemistry MCQs
- Class 11 Chemistry MCQs
- Class 10 Chemistry MCQs
- Class 9 Chemistry MCQs
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