Subject: Chemistry
Time : 3 hrs. Marks.
75
Group A (Descriptive)
1. a) Write the basic postulates of kinetic
theory of gases. 4
b) Oxidation and reduction take place
simultaneously explain with electronic concept. 4
c) What is Radioactivity? Discuss the
nuclear fusion reaction with example. 4
d) How many molecules are present in 25 ml
gas at 300c and 740 mm pressure?
or
a) Write down the Dalton's law of partial pressure. Deduce the
relation between partial 1+3
pressure of
a gas and mole fraction.
b) State the modern periodic law. Discuss
the position of Hydrogen in the periodic table. 4
c) Write the electronic configuration of
the following : 3
Cu
(29); Al
; S
.


d) At 270c 200 cm3
of H2 at 30 cm (Hg) pressure
and 300 cm3 of N2 at 40 cm (Hg) pressure are kept in a vacuum. flask of 400 com3.
Calculate the total pressure of the gas mixture at that temperature.
2. a) Write down
the modern periodic law. and three defects of modern periodic table. 4
b) Write the fundamental postulates of
Bohr's atom model. 4
c) What is ionic bond? Explain with
example. 4
d) What types of bond are present in the
following compounds:- 3
i) Ca Cl2 ii)
CH4
or.
a) (i) "Chemical
equilibrium is always dynamic"- explain. 3
(ii) Write down two differences between orbit
and orbital. 2
b) Diagonal relationship remains in
between lithium and Magnesium - explain. 3
c) Explain ionic character of covalent bond
and covalent character of ionic bond. 4
d) Find the RMS velocity of O2
gas at O0c temp. 3
3. a) Explain exothermic reaction and
endothermic reaction with example. 4
b) What is La-chatelier's principle?
Explain the effect of temperature on chemical equilibrium according to this principle.
c) What are possible and what are not
possible of the following orbitals explain. 3
2p,
1p, 4 S.
d) A piece of iron is dipped into H2 SO4
Soln . To oxidize the produced ferrous sulphate fully into ferric ion 0.01M KM n04 Soln of 95 ml. is needed. What is the mass of that
iron piece?
or, a) Show the balancing reaction of
potassium permanganate by hydrogen sulphide in presence of dilute sulphuric acid.
b) What is Radioactivity? What change
takes place when a radioactive element emits
-ray?

c) What is electro negativity? Why electronegativty increases with the
increasing atomic
number of
elements in a period.
d) To oxidize 0.5g impure green vitriol 5
ml of 0.05m kMnO4 solution is needed. Find the percentage of impurities in this green vitriol.
Group B ( short
Type)
4. a) What is meant by the Hybridization of
orbitals? 3
b) Why is Hcl polar? 2
or, a) Calculate the oxidation number of the
underlined elements in the following compounds. 3
i) K MnO4 ii) Na2 S2 O3
iii) K2
Cr2 O7.
b) What are S.T.P and S.A.T.P
5. a) Find the position of the following
elements in the periodic table. 3
(i) Sc ( 21) ii) K
(19) iii) P (15)
b) What is co-ordinate bond? Give example.
2
or a) Describe Rutherford's atomic model. 3
b) Arrange Mg Cl2, AlCl3
according to their ionic character. 2
6. a) What is iodometry and iodimetry? 3
b) What is law of mass action? 2
or a) Explain why Na+ is possible
but not Na 2+. 2
b) Write down the causes for the inertness
of inert gases. 3
7. a) Complete the reactions : 3







b) Describe the Rutherford's
- scattering experiment. 2

or a) What is redox reaction ? 2
b) Show the electronic configuration of, 3
i)
Fe 3+ (26) ii) Zn 2+ (30) iii) Cu
(29)
8. a) State graham's diffusion law. From this
law how will you determine molecular weight 4
of an
unknown gas?
b) What is Hund's rule. 1
or a) What is quantum number? Describe the
significance of magnetic and subsidiary quantum 4
number.
b) What is pauli's Exclusion principle. 1
9. a) What is principal quantum number. 3
b) Which one is more ionic and why KCl or
Ca Cl2. 2
or a) What is Electron Affinity? How electron
affinity changes in a period of the periodic table? 3
b) In NH3, why the bond angle
of H -N- H is 1070?
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