CBSE Guess > Papers > Question Papers > Class XII > 2003 > Chemistry > Compartment Delhi Set -II.

CHEMISTRY—2003 (Set II—Compartment Delhi)

Q. 1. What is the difference between glass and quartz, though both contain SiO ₄ units? 1

Q. 7. What is the state of hybridization of nitrogen in the nitrate ion, 1

Q. 8. Name two phenomena that indicate the dull nature of electrons. 1

Q. 10. On mixing equal volumes of water and ethanol, what type of deviation would you expect from Raoult's law? 1

Q. 11. Describe and explain what is observed when 2
(i) a beam of light is passed through a colloidal solution of As ₂ S ₃ .
(ii) an electric current Is passed through a colloidal solution.

Q. 14. Write the chemical equation representing the system of glyptal. Mention any one of its uses in industry. 2

Q. 26. The specific rate constant for a particular reaction is 2.34 x 10 ^-3 mol L ^-1 s ^-1 at 370 K and 7.50 x 10 ^-2 mol L ^-1 s ^-1 at 400 K. Calculate the activation energy for the reaction.
[R = 8.314 JK ^-1 mol ^-1]

Q. 28. (a) Using valence bond theory deduce the geometry and magnetic nature of [Ni (CN) ₄ ] ^2- .
(At. No. of Ni = 28)
(b) Name the geometrical isomers of [Co(en) ₂CI ₂ ]⁺ .
(en = ethylenediamine) 3

Q. 30. (a) Calculate the electrode potential of silver electrode dipped in a 0.1 M solution of silver nitrate at 298 K assuming silver nitrate to be completely dissociated. The standard electrode potential of
(b) At what concentration of silver ions will this electrode have a potential of zero volt? 3

Q. 31. (a) Complete the following nuclear reactions:
(i) (ii)
(b) A piece of wood from an old cave gives 6 counts per minute for one gram of carbon. How old is the piece of wood, if in a freshly cut wood the number of counts per minute per gram of carbon is 15.3? 3

Chemistry 2003 Question Papers Class XII
Delhi		Outside Delhi		Compartment Delhi		Compartment Outside Delhi
	Set I		Set I		Set I		Set I
	Set II		Set II		Set II		Set II