CBSE Class 12 Chemistry Question paper 2006 (3)

CBSE Class 12 Chemistry Question paper 2006 (3). Students can download the last year question papers using the link below. Free download of examination question papers with solutions.Last 10 year question papers should be practised to get better marks in examinations.

Q. 1. Name the crystal which lowers the density of an ionic crystal.

Q. 2. Of 0.1 molal solutions of glucose and sodium chloride respectively, which one will have a higher boiling point?

Q. 3. What is meant by elementary step in a reaction?

Q. 4. Draw the structural formula of hex-2-en-4-y-noic acid.

Q. 5. Why are aqueous solutions of amines basic in nature?

Q. 6. How does the principal quantum number (say n = 4) of an energy level of electrons in an atom limit the maximum number of electrons that can be accommodated at that level?

Q. 7. Give an example of a spontaneous process which is endothermic.What makes it spontaneous?

Q. 8. What happens when

i. Chlorine is passed through a hot concentrated solution of an alkali like Ba(OH) 2 ?

ii. XeF4 undergoes hydrolysis?

Write the chemical equation in each case.

Q. 9. What is meant by ‘lanthanoid contraction’? State one use each of lanthanoid metals and their oxides.

Q.10. Draw three dimensional representations of 2-butanol which are of R and S type.

Q.11. How are the following conversions carried out?.

i. Benzyl chloride to benzyl alcohol

ii. Ethyl magnesium bromide to propan-1-ol.

Q.12. Write the names of monomers used for getting the polymers PVC and PMMA. State one use for each of these polymers.

Or

Giving one example for each differentiate between thermosetting and thermo plastic polymers.

Q.13. Explain the following with suitable examples:

a. An n-type semiconductor

b. Piezoelectric effect

Or

a. With reference to a crystal structure, what is meant by coordination number?

b. What is the coordination number of atoms

i. in a cubic close packed structure,

ii. in a body-centred cubic structure?

Please click the link below to download pdf file of CBSE Class 12 Chemistry Question paper 2006 (3).