F.Sc. Part 1 Chemistry Paper Faisalabad Board 2012 (Malik Xufyan)

1. Malik Xufyan 0313-7355727
FAISALABAD BOARD 2012
Paper: Chemistry (Part 1) (Objective Type)
Time: 20 Minutes Marks: 17
Note: Four answers are given against each column A, B, C and D. Select the right answer and on the separate answer sheet, fill the circle A, B, C and
D with pen or marker in front of question number.
A B C D
1 When 6d orbital is complete the entering electron goes
into:
7f 7S 7P 7d
2
Splitting of spectrum ines when itoms are subjected to
strong electric field is called:
Zeeman effect Stark effect
Photoelectric
effect
Compton effect
3 Which is a pseudo solid? 𝐶𝑎𝐹 𝑁𝑎𝐶𝑙 Glass All
4 When water freezes at 0℃ its density decreases due to:
Cubic structure of
ice
Empty spaces
present in
structure of ice
Chane in bond
length
Change in bond
angles
5
A real gas obeying wander wall equation will resemble
ideal gas if:
Both ‘a’ and ‘b’
are large
Both ‘a’ and ‘b’
are small
‘a’ is small and
‘b’ is large
‘a’ is large and ‘b’
is small
6
If abolute temperature of a gas is doubled and the
pressure is reduced to one half , the volume of the gas
will:
Remain
unchanged
Increase four
times
Reduce to Be doubled
7
The comparitive rates at which the solute move in
paper chromatography depend on:
Size of paper
Temperature of
the experiment
𝑅 value of solute
Size of chromate-
grphic tank used
8 The mass of 1 mole of electron is: 1.008 mg 0.5 mg 0.184 mg 1.673 mg
9 In zero order reaction the rate is independient of:
Temperature of
reaction
Concentration of
reactants
Concentration of
products
None
10
If the salt bridge is not used between two half cells
then voltage:
Decrease rapidly Decrease slowly Does not change Drops to zero
11 Stroger the oxidizing agent, greater is the:
Oxidation
potential
Redox potential
Reduction
potential
EMF of cell
12
A solution of glucose is 10% the value in which one
gram mole of it is dissolved will be:
1 𝑑𝑚 1.8 𝑑𝑚 200 𝑑𝑚 900 𝑑𝑚
13
The solubility product of 𝐴𝑔𝐶𝑙 is
2.0 × 10 𝑚𝑜𝑙 𝑑𝑚 the maximum concentration of
𝐴𝑔 ions in the solution is:
2.0 × 10 𝑚𝑜𝑙 𝑑𝑚 1.4 × 10 𝑚𝑜𝑙 𝑑𝑚 1.0 × 10 𝑚𝑜𝑙 𝑑𝑚 4.0 × 10 𝑚𝑜𝑙 𝑑𝑚
14
The change in the heat energy of a chemical reaction at
constant temperature and pressure is called:
Enthalpy change
Heat of
sublimation
Bond energy
Internal energy
change
15 A limiting reactant is the one which:
It takes in lesser
quantity in grams
as compared to
other reactants
It takes in lesser
quantity in
volume as
compared to other
reactants
Gives maximum
amount of the
products which is
required
Gives minimum
amount of the
products under
consideration
16 𝑂 𝑂 𝐵 𝐹
17
Which hydrogen halides have the highest percentage of
ionic charaters?
HCl HBr HF HI

2. Malik Xufyan 0313-7355727
SECTION-1
2. Attempt any EIGHT short questions: ( 16)
(i) Differentiate between empirical and molecular formula?
(ii) Write the experimental yield is always less than theoretical
yield?
(iii) No individual Neon atom in the sample of the element has a
mass of 20.18 amu. Discuss?
(iv) Explain the process of sublimation?
(v) Concentrated HCl and 𝐾𝑀𝑛𝑂 solutions can not be filtered
by using filter paper. Discuss?
(vi) Define Boyle’s law and give its mathematical expression?
(vii) Convert −40 𝐶 of 𝐹 ?
(viii) State what is natural and artificial plasma?
(ix) Why gases show non ideal behavior at low temperature and
high pressure?
(x) Define boiling point?
(xi) Why do we feel cooling effect after taking bath?
(xii) Metals are malleable and ductile. Justify?
3. Attempt any EIGHT short questions: (16)
(i) Give two defects of Bohar’s atomic model?
(ii) Define Moseley’s law. Give its mathematical equation?
(iii) State high senberg’s uncertainly principle?
(iv) Define ionization energy. How does it vary in the periodic
table?
(v) Define bond length and Bond energy?
(vi) Define system and surrounding? Give one example of each.
(vii) Why is it necessary to mention the physical states of
reactants and product in a thermochemical reaction?
(viii) What is lattice energy? Give one example.
(ix) Give two definitions of Raoult’s law?
(x) Define solubility curve? Names its two types.
(xi) Give two function of salt bridge?
(xii) How is rate of reaction influenced by surface area?
4. Attempt any SIX short questions: ( 12)
(i) Why abnormality of bond length and bond strength in HI is
less prominent than that of HCl?
(ii) Write short note on atomic radii and ionic radii? Give
example.
(iii) What is the effect of common ions on solubility?
(iv) How can you determine 𝐾 from solubility?
(v) Define buffer capacity?
(vi) What is the effect of catalyst on equilibrium constant (Kc)?
(vii) Define electrode potential. Give example?
(viii) Define electrolytic induction? Give example.
(ix) Define energy of activation?
SECTION-2
Note: Attempt any THREE questions
5. (a) Define and explain the concept of mole and Avogadro’s
number with examples?
(b) What are intermolecular forces? Write the names of different
types of their forces and explain instantaneous dipole – induced
dipole forces?
6. (a) Define Bond energy and explain the various parameters which
determine its strength?
(b) When 2.00 moles of 𝐻 and 1.00 mole of 𝑂 at 100 𝐶 and 1
torr pressure react to produce 2.00 moles of gasesous water, 488.5
KJ of energy is evolved. What are the values of (𝑎) ∆𝐻 and (𝑏) ∆𝐸
for the production of 1 mole of 𝐻 𝑂( )?
7. (a) A sample of Nitrogen gas is enclosed in a vessel of volume
380 𝑐𝑚 at 120 𝐶 and pressure of 101325 𝑁𝑚 . This gas is
transferred to a 10 𝑑𝑚 flask and cooled to 27 𝐶. Calcultae the
pressure in 𝑁𝑚 exerted by the gas at 27 𝐶?
(b) Discuss properties of cathode rays?
8. (a) Prove that 𝑝𝐾 + 𝑝𝐾 = 𝑝𝐾 ?
(b) Explain “LEAD ACCUMULATOR” with charging and
discharging?
Time: 02:40 Hours (Subjective Type) Marks: 68

3. Malik Xufyan 0313-7355727
9. (a) Explain the fractional distillation. Justify the two curves when
composition is plotted against boiling point of the solution.
(b) Discuss the factors which influence the rate of rates of
chemical reactions?