CBSE Class 12 Chemistry Question paper 2005 (1)

CBSE Class 12 Chemistry Question paper 2005 (1). 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. What is the maximum possible coordination number of an atom in an hcp crystal structure of an element?

Q.2. State the formula relating pressure of a gas with its mole fraction in a liquid solution in contact with it.

Q.3. Express the relation between the half-life period of a reactant and its initial concentration if the reaction involved is of second order.

Q.4. How are formalin and trioxane related to methanol?

Q.5. Why are primary amines higher boiling than tertiary amines?

On the basis of Heisenberg Uncertainty Principle show that the electron (mass=9 x 10 ^-31 kg)cannot exist within an atomic nucleus of radius 10 ^-15 m.

Q6. Write one chemical reaction each to show that

(a) Tin (II) chloride is a reducing agent.

(b) Chlorine gas can be obtained from bleaching powder.

Q.7. Describe the steps involved in the preparation of either potassium dichromate from sodium chromate or potassium permanganate from manganese dioxide.

Q.8. What are enantiomers and diastereomers? Differentiate between chiral and achiral

molecules.

Q.9. Give an illustration of Reimer-Thiemann reaction.

Q.10. How bakelite made and what is is its major use?Why is bakelite a thermo-setting polymer'

Q.11. (a) What is meant by linear combination of atomic orbital?

(b) Illustrate bonding and ant bonding molecular orbital based on bomb-nuclear dihydrogen molecule.

OR

What kinds of molecular forces are expected to exist between the species in any three of the following pairs constituting mixtures?

Please click the link below to download pdf file of CBSE Class 12 Chemistry Question paper 2005 (1).