F.Sc. Part 1 Chemistry Paper Faisalabad Board 2013 (Malik Xufyan)

1. Malik Xufyan 0313-7355727
FAISALABAD BOARD 2013
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
𝑁𝐻 Shows a maximum boiling point among:
Very small size of
nitrogen
Lone pair of
electron present
on nitrogen
Enhanced
electronegative
character present
Pyramidal
structure of 𝑁𝐻
2
The deviation of a gas from ideal behavior is
maximum at:
−10 𝐶 to 5.0 atm −10 𝐶 to 2.0 atm 100 𝐶 to 2.0 atm 0 𝐶 to 2.0 atm
3
The comparative rates at which the solutes move in
paper chromatography depend on:
The size of the
paper
𝑅 values of
solutes
Temperature of
the experiment
Size of chromate-
graphic tank used
4
The number of moles of 𝐶𝑂 which contains 8.0 gram
of oxygen:
0.25 0.50 1.0 1.50
5 The mass of 1 mole of electrons is: 1.008mg 0.55mg 0.184mg 1.673mg
6
If the rate equation of a reaction to 𝐴 + 𝐵 ⎯⎯⎯⎯⎯
products is, rate = 𝐾[𝐴] [𝐵] and 𝐴 s present in large
excess, then the order of reaction is:
1 2 3 None
7
If the salt bridge is not used between two half sells
then the voltage:
Decrease rapidly Decrease slowly Does not change Drops to zero
8 Stronger the oxidizing agents, greater is the:
Oxidation
potential
Reduction
potential
Redox potential EMF of the cell
9
18 g glucose is dissolved in 90 gram of water, the
relative lowering of vapour pressure is equal to:
1
5
5.1
1
51
6
10
For which system does the equilibrium constant 𝐾 has
unit of (concentration) :
𝑁 + 3𝐻
⇌ 2𝐻𝑁
𝐻 + 𝐼 ⇌ 2𝐻𝐼 2𝑁𝑂 ⇌ 𝑁 𝑂 2𝐻𝐹 ⇌ 𝐻 + 𝐹
11
The pH of 10 , 𝑚𝑜𝑙 𝑑𝑚 of an aqueous solution of
𝐻 𝑆𝑂 is:
3.0 2.7 2.0 1.5
12
If an endothermic reaction is allowed to take place
very rapidly in the air, the temperature of the
surrounding air:
Remain constant Increases Decreases
Remains
unchanged
13
Which of the hydrogen halide has the highest
percentage of ionic character?
HF HCl HBr HI
14 The number of bonds in Nitrogen molecule is:
One sigma and
one pi
One sigma and
two pi
Three sigma only
Two sigma and
one pi
15 Quantum number values for 2p orbitals are: 𝑛 = 2, 𝑙 = 1 𝑛 = 1, 𝑙 = 2 𝑛 = 1, 𝑙 = 0 𝑛 = 2, 𝑙 = 0
16 Orbitals having same energy are called: Hybrid orbitals Valence orbitals
Degenerate
orbitals
d-orbitals
17 The molecules of 𝐶𝑂 in dry ice from the: Ionic crystals Covalent Crystals Molecular crystals
Any type of
crystals

2. Malik Xufyan 0313-7355727
SECTION-1
2. Attempt any EIGHT short questions: ( 16)
(i) Write formulas used for determination of pressure of 𝐶 and
𝐻?
(ii) 11gm of carbon is reacted with 32gm of 𝑂 to give 𝐶𝑂 .
Which one is limiting reactant?
(iii) Explain 𝑁 and 𝐶𝑂 gave the same number of electrons,
protons and neutrons?
(iv) Differentiate between stationary phase and mobile phase?
(v) What is disadvantage of slow cooling in crystallization?
(vi) What is absolute zero? What happens to real gases while
approaching it?
(vii) Write SI units of “𝑎” and “𝑣” (Vander Waal’s constant).
(viii) Define diffusion and effusion?
(ix) How sea life survives under frozen sea?
(x) Why heat of sublimation is greater than heat of
vaporization?
(xi) Give four applications of liquid crystals.
(xii) Ionic crystals do not conduct electricity in the solid state.
Explain?
3. Attempt any EIGHT short questions: (16)
(i) Give any two nuclear reactions.
(ii) Give the electronic configuration of an element atomic
number 29?
(iii) Define Hund’s rule with an example?
(iv) Give drawbacks of Rutherford’s atomic model?
(v) What is the trend of ionization energy is the periodic table in
a group and why?
(vi) How electronegativity values of elements help us in
understanding the nature of chemical bond?
(vii) Draw and explain the geometry of 𝑁𝐻 molecule according
to valance shell electron pair repulsion theory?
(viii) Define bond order and what is bond order of 𝑂?
(ix) Define Hess’s law of constant heat summation?
(x) Why is it necessary to mention the physical states of
reactants and products in a thermochemical reaction?
Explain with an example?
(xi) What are buffer solutions? Give one use of buffer solution?
(xii) Why solid 𝑁𝐻 𝐶𝑙 is added in qualitative analysis of 3rd
group basic radicals before adding 𝑁𝐻 𝑂𝐻?
4. Attempt any SIX short questions: ( 12)
(i) How 𝑁𝑎𝐶𝑙 can be purified by common iron effect?
(ii) The sum of mole fractions of the all components is always
equal to unity for any solution. Justify?
(iii) Define colligative properties. Name two important
colligative properties?
(iv) What are hydrates? How they are formed.
(v) What is the function of salt bridge in galvanic cell?
(vi) What are electrode reactions in lead accumulator battery?
(vii) Impure 𝐶𝑢 can be purified by electrolytic process. Give
reason?
(viii) Define rate of reaction and order of reaction?
(ix) Write two characteristics of enzyme catalysis?
SECTION-2
Note: Attempt any THREE questions
5. (a) What is electron pool theory regarding to metallic solids? Also
give its four properties.
(b) When limestone is roasted, quicklime (𝐶𝑎𝑂) is produced
according to the following equation. The actual yield of 𝐶𝑎𝑂 is
2.5 kg, when 4.5kg of limestone is roasted. What is the percentage of
yield of this reaction? 𝐶𝑎𝐶𝑂 ( ) ⎯⎯ 𝐶𝑎𝑂( ) + 𝐶𝑂 ( ). Where
atomic mass of 𝐶𝑎 = 40, 𝐶 = 12 and 𝑂 = 16.
6. (a) Define 𝑆𝑝 hybridization and on its basis explain the structure
of ethene?
(b) Describe how the enthalpy of combustion of a substance is
measured by bomb calorimeter?
7. (a) What is a kinetic molecular theory of gases? Derive Boyle’s
law from kinetic equation.
(b) What are X – rays? Give the conclusions drawn by Mosley
from the study of spectral lines.
8. (a) Give the industrial importance of electrolysis process in detail.
(b) Calculate the pH of: (1) 10 𝑚𝑜𝑙 𝑑𝑚 of 𝐻𝐶𝑙
(2) 1.0 𝑚𝑜𝑙 𝑑𝑚 of 𝐻 𝑋, which is only 50% dissociated. (𝐻 𝑋 is
dibasic acid)
Time: 02:40 Hours (Subjective Type) Marks: 68

3. Malik Xufyan 0313-7355727
9. (a) Explain Raoult’s law when both components are volatile?
(b) Define order of reaction. How does half life method can be
used for its determination?