CHEMISTRY MODEL QUESTION PAPER -2009-2010-

Q 1. What designation is given to an orbital having n=3, l=0

Q 2. What are the units of surface tension?

Q 3. State modern periodic law.

Q 4. Give the IUPAC name of tertiary butyl alcohol.

Q 5. Write conjugate acid and base NH3.

Q 6. Give the relation between standard Free energy change and Equilibrium constent.


Q 7. An alkene A on ozonolysis gives a mixture of Ethanal & Propanal. Write the
structure of A

Q 8. Determine the oxidation number of underlined element in.
NaBH4

Q 9. What do you understand by the term Electron gain enthalpy ? How it is different
from Electro negativity

Q 10. What are the various factors due to which the Ionisation enthalpy of the main group
Element tends to decrease down a group.?

Q 11. Define the terms -: ( a) Entropy ( b) Enthalpy of combustion
OR
Explain Hess law of constant heat summation with the help of an example

Q 12. In what ways Be shows anomalous behavior than other elements of same group
chemically ( Give equations).
Q 13. Complete the following reactions.
(a) CH3-CH=CH2 + H2O HgSO4 /H+ ?
( b) CH3-CH2-Br + Na Ether ?

Q 14. Explain Why ?
(a) Pb (IV) is less stable than Pb (II).
(b) BCl3 Molecule has Zero dipole moment.

Q 15. Balance the given redox reaction in acidic medium.
MnO4
-
+ SO2 Mn2+ + HSO4
-

Q 16. What is the maximum number of emission lines obtained when the exited electron
of a H atom in n=6 drops to the ground state .

Q 17. Compare the relative stability of the following species and indicate their magnetic
Properties on the basis of MOT (i) O2, (ii) O2
2-

Q 18 Explain why ?
(a) Cs is used in photoelectric cell.
(b) Potassium carbonate can not be prepared by solvey process.

Q 19. (a)Calculate the molarity of Oxalic acid in the solution prepared by dissolving its
2.52 gm in enough water to form 250 ml of the solution.
(b)Round off the following in three significant figures
(a) 3289 (b) 0.03265

Q 20 (a) State Pauli’s exclusion principle.
(b) Write the electronic configuration of Co+3. & find out the number of unpaired
electrons present in it.

Q 21. Calculate the enthalpy of combustion of Ethylene gas to form carbon dioxide and
water at 298 K and 1 atm preassure. The enthalpies of formation of CO2, H2O &
C2H4 are -393.5,-241.8 & +52.4 kj mol-1 respectively.

Q 22. Explain the following.
(a) (i) Carbon monoxide is more dangerous than carbon dioxide .why ?
(ii) Statues and monuments in India are affected by acid rain How?
(b)What are the full forms of MIC & BOD.?

Q 23. (a) What are Electrophiles explain with example
(b) Define Position isomerism with example.

Q 24. (a) 0.50 gm of an organic compound was Kjeldahlised and the ammonia obtained
was passed into 100 ml of M/10 H2SO4 .The excess acid required 160 ml of M/10 NaOH
for neutralization .calculate the percentage of nitrogen in the compound.

Q 25. (a) Write the favorable factors for the formation of Ionic bond.
(b ) Discuss the shape of NH3 molecule using VSEPR theory.
.

Q 26. Density of a gas is found to be 5.46 g/dm3 at 27C at 2 bar pressure . calculate the
density at STP.
OR
(a) Explain the physical significance of van dar waals parameter also give their
units.
(b) In terms of Charle’s law explain why -273C is the lowest possible
temperature?

Q27. What causes the temporary and permanent hardness of water .discuss the method of
softening of hard water by ion exchange method.

Q28 (a) write short notes on -:
(i) common ion effect
(ii) PH
(iii) Heterogeneous equilibrium
(b)A sample of HI (g) is placed in a flask at a pressure of 0.2 atm .At equilibrium
partial pressure of HI (g) is 0.04 atm. What is Kp for the given equilibrium?
reaction
2HI (g)  H2 (g) + I2 (g)
OR
(a) What are the application of equilibrium constant.
(b) Write expression for Kc for the reaction
CaCO3 (s)  CaO(s) + CO2(g)
(c) Discuss the effect of catalyst & addition of inert gas at constant pressure for
the reaction
2SO2 (g) + O2 (g)  2SO3 (g)

Q29 (a) Write the IUPAC names of the product obtained by the ozonolysis of
following compounds
(i) Hex-2-ene (ii) 2-Ethyl but –1-ene
(b) Why is Wurtz reactionnot preferred for alkanes containing odd number of
carbon aatoms ? Illustrate your answer by taking one example
OR
(a) Complete the following equations
(i)CH3-CH=C-CH3 + H2O H+/Hg++

CH3
(ii) CH3-CH2-CH =CH2 + HBr Peroxide
(iii) C6H6 + Cl2 AlCl
3
(b) What are the necessary conditions for any system to be aromatic ?

Q30. (a) Assign reason for each of the following
(i) Ga (I) undergoes disproportionation reaction.
(ii) Anhy. AlCl3 used as catalyst
(iii) Boron is unable to form BF6
-
ion explain
(b)Complete the following equation.
(i) SiO2 + HF  ?
(ii) BCl3 + H2O  ?
OR
(a) Write equation to justify amphoteric nature of Aluminium.
(b) Give reasons :
(i) Conc HNO3 can be stored in Aluminium container
(ii) Ionization enthalpy decreases from carbon to silicon.
(iii)