F.Sc. Part 1 Paper Faisalabad Board 2008 (Malik Xufyan)

1. Malik Xufyan 0313-7355727
FAISALABAD BOARD 2008
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
In combustion analysis water vapours are absorbed in: 50% 𝐾𝑂𝐻 𝑀𝑔(𝐶𝑙𝑂 ) 𝑁𝑎𝑂𝐻 𝑀𝑔𝐶𝑙
2 In chromatography the stationary phase: Is a solid
May be liquid or
gas
𝑁𝐻 𝐶𝑙 Iodine
3 Which chemicals do not undergo sublimation? 𝐾𝑀𝑛𝑂 Naphthalene 𝑁𝐻 𝐶𝑙 Iodine
4 Which has same number of molecules at S.T.L?
11.2 𝑑𝑚 of 𝑂
and 32 g of 𝑂
44 g of 𝐶𝑂 and
1 𝑑𝑚 of 𝐶𝑂
28 g of 𝑁 and
5.6 𝑑𝑚 of 𝑂
280 ml of 𝐶𝑂 and
280 𝑐𝑚 of 𝑁 𝑂
5
The order of rate of diffusion of gases 𝑁𝐻 , 𝑆𝑂 , 𝐶𝑙
and 𝐶𝑂 is:
𝑁𝐻 > 𝑆𝑂 > 𝐶𝑙
> 𝐶𝑂
𝑁𝐻 > 𝐶𝑂 > 𝑆𝑂
> 𝐶𝑙
𝐶𝑙 > 𝑆𝑂 > 𝐶𝑂
> 𝑁𝐻
𝑁𝐻 > 𝐶𝑂 > 𝐶𝑙
> 𝑆𝑂
6 London dispersion forces are significant for: Polar molecules Ionic solids Metals
Non – polar
molecules
7
Which substance show an isotropic behavior in
electrical conductivity?
Diamond Graphite KCl Ice
8 Quantum number values for 2𝑝 orbitals are: 𝑛 = 1, 𝑙 = 1 𝑛 = 2, 𝑙 = 2 𝑛 = 2, 𝑙 = 1 𝑛 = 1, 𝑙 = 0
9 Orbitals having same energy are called: Hybrid orbitals
Degenerate
orbitals
Valence orbitals Molecular orbitals
10
The four equivalent 𝑆𝑝 hybrid in space are at angles
of:
120 107.5 109.5 104.5
11
Which has unpaired electrons in antibonding molecular
orbital? 𝑁 𝑂 𝐵 𝐹
12 At constant volume 𝑞(𝑣) is equal to: ∆𝐻 ∆𝐸 ∆𝑃 ∆𝑉
13
The solubility product of 𝐴𝑔𝐶𝑙 is
2 × 10 𝑚𝑜𝑙𝑒 . 𝑑𝑚 . The maximum concentration
of 𝐴𝑔 in solution is:
2.0 × 10 𝑚𝑜𝑙𝑒 𝑑𝑚 1.0 × 10 𝑚𝑜𝑙𝑒 𝑑𝑚 1.41 × 10 𝑚𝑜𝑙 𝑑𝑚 4.0 − 10 𝑚𝑜𝑙𝑒 𝑑𝑚
14 The pH of human blood is: 3.5 5.35 7.35 8.35
15 The molal boiling point elevation depends upon: Nature of solvent
Vapour pressure
of solution
Nature of solute H solution
16 The oxidation potential of (SHE) is: 0.02V 0.1V 0.00V 0.20V
17 This reaction is catalyzed by: Nickel gauze Platinum gauze Copper gauze Palladium gauze

2. Malik Xufyan 0313-7355727
SECTION-1
2. Attempt any 22 short questions: ( 44)
(i) Write down the main postulates of Dalton’s atomic theory?
(ii) Give the assumptions for stoichiometric calculations.
(iii) 23g of sodium and 39g of potassium have equal number of
atoms. Justify?
(iv) What is crystallization?
(v) Rf value is always less than 1.0. Comment on it.
(vi) Give the quantitative definitions of Charles’s law?
(vii) What do you mean by Absolute zero?
(viii) What are faulty points in kinetic molecular theory of gases?
(ix) Differentiate between oxidation and reduction?
(x) Define Electrochemistry.
(xi) What is Standard electrode potential?
(xii) London dispersion forces are weaker than dipole – dipole
forces. Why?
(xiii) Why the ionic crystalline solids have high melting points?
(xiv) The vapour pressure for solids is less than those of liquids?
Give reason.
(xv) Ice floats on water. Justify?
(xvi) Which observation tells the presence of positive rays in
discharge tube?
(xvii) What particles are formed by the decay of free neutron?
(xviii) Distribute the electrons in orbitals of 𝐶𝑢(29) and 𝐵𝑟(37)?
(xix) What is Mosley’s law?
(xx) The sum of mole fractions of all components is always equal
to unity for an solution. Justify?
(xxi) The relation lowering the vapour pressure is independent of
temperature. Justify?
(xxii) Give two statements of Raoult’s law?
(xxiii) Why the atomic radii increase down the group?
(xxiv) Why ionization energies if VI – A group elements decreases
down the group?
(xxv) How molecular orbital theory justifies that Helium atoms
cannot make the 𝐻𝑒 ?
(xxvi) Why the dipole moment of 𝐶𝑂 is zero and that of 𝐻 𝑂 is
1.85D?
(xxvii) What is a spontaneous process?
(xxviii) What is meant by standard enthalpy of atomization?
(xxix) What will be the effect of change in pressure on ammonia
(𝑁𝐻 ) synthesis.
N ( ) + 3H ( ) ⎯⎯⎯⎯⎯⎯⎯⎯⎯ 2NH ( )
(xxx) How does a catalyst affect reversible reaction?
(xxxi) What is Henderson equation?
(xxxii) What is zero order of reaction?
(xxxiii) What is the effect of temperature on the activation energy of
a reaction?
SECTION-2
Note: Attempt any THREE questions
3. (a) What are isotopes? How do you deduce the fractional atomic
masses of elements from the relative isotopic abundance? Give one
example.
(b) 250𝑑𝑚 of the sample of hydrogen effuses four times as
rapidly as 250𝑑𝑚 of an unknown gas. Calculate the molar mass of
unknown gas?
4. (a) Define Vapour pressure. Describe monometric method for the
measurement of vapour pressure?
(b) Define the following terms: (i) State function (ii) Internal
energy (iii) Heat
5. (a) How the charge on the electron was determined by Millikan’s
oil drop method?
(b) Calculate the percentage ionization of acetic acid in a solution
in which 0.1moles of it’s has been dissolved per 𝑑𝑚 of the
solution?
6. (a) What do you understand by the term Electronegativity?
Discuss its variation in the periodic table. How does it affect the
bond strengths of a covalent bond?
Time: 02:40 Hours (Subjective Type) Marks: 68

3. Malik Xufyan 0313-7355727
(b) How molecular weights of a solute is determined with the
help of ∆𝑇 ?
7. (a) Define electrode potential. Describe the concentration of
voltaic cell and reaction occurring in this cell.
(b) How the rate of reaction is affected by temperature? Explain.