F.Sc. Part 1 Chemistry Paper Faisalabad Board 2011 (Malik Xufyan)

1. Malik Xufyan 0313-7355727s
FAISALABAD BOARD 2011
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
Octet role is not obeyed by during its formation: 𝑁𝐹 𝐶𝐹 𝑃𝐶𝑙 𝐶𝐶𝑙
2 Standard enthalpy change is measured at: 298k 273 𝐶 273k 373k
3 The units for 𝐾𝑊 of 𝐻 𝑂 are: 𝑚𝑜𝑙𝑒𝑠 𝑑𝑚 𝑚𝑜𝑙𝑒𝑠 𝑑𝑚 𝑚𝑜𝑙𝑒𝑠 𝑑𝑚 𝑚𝑜𝑙𝑒𝑠 𝑑𝑚
4 The pH of mixtre of 𝐶𝐻 𝐶𝑂𝑂𝑁𝑎 and 𝐶𝐻 𝐶𝑂𝑂𝐻 is: 7 >7 <7 1
5
Amount of 𝑁𝑎𝑂𝐻 required to prepare 250 𝑐𝑚 of 1 M
solution is:
10g 6g 2g 4g
6 Cathode in 𝑁𝐼𝐶𝐴𝐷 cell is: 𝐴𝑔 𝑂 𝑁𝑖𝑂 𝐶𝑑 𝑍𝑛
7 Percentnage of 𝐻 𝑆𝑂 used in lead accumulator is: 40% 25% 30% 50%
8
The order of reaction for the reaction
𝑁𝑂 + 𝑂 ⎯⎯⎯⎯⎯ 𝑁𝑂 + 𝑂 :
2 3 1 0
9 Percentage of 𝑁 in 𝑁𝐻 is:
14
17
× 100
14
34
× 100
3
17
× 100
3
34
× 100
10 Isotopes differentiate in number of: Electron Neutron Proton Proton number
11 The most common solvent used in slovent extraction is: Acetone Ethanol Rectified siprit Diethyl eather
12 Density of an ideal gas can be calculated by the formula: 𝑑 = 𝑛𝑅𝑇 𝑑 =
𝑃𝑀
𝑅𝑇
𝑑 =
𝑚
𝑀
𝑅𝑇 𝑑 =
𝑃𝑉
𝑀
13 Transition temperature of Tin (Sn) is: 128 𝐶 95.5 𝐶 13.2 𝐶 32.8 𝐶
14 Whater has maximus density at: 4.0 𝐶 0 𝐶 100 𝐶 10 𝐶
15 Orbitals having equal energy are called: Valence orbital
Dengenerate
orbital
d-orbital Molecular orbital
16 The number of neutron present in 𝐾 is: 39 18 20 19
17 The most electronegative element is: 𝑁 𝐹 𝑂 𝐻

2. Malik Xufyan 0313-7355727s
SECTION-1
2. Attempt any 22 short questions: ( 44)
(i) List steps involved to identify a limiting reactant?
(ii) Explain relative abundant of isotopes with suitable example?
(iii) A limiting reactant controls the amount of reactant
consumed in a chemical reaction. Comment the statement?
(iv) Define Rf value and why it has no unit?
(v) Iodine is more soluble in water in pressure of KI. Discuss.
(vi) List four postulates of kinetic theory?
(vii) Define Dalton’s law of partial pressure. Give mathematical
expression?
(viii) Gases show non-ideal behavior at low temperature and high
pressure. Justify the statement.
(ix) Ice floats on 𝐻 𝑂. Give reason?
(x) Explain the working of pressure cooker?
(xi) Describe crystallographic elements?
(xii) Graphite is conductor but diamond is insulator. Give reason?
(xiii) Write electronic configuration foe an element with atomic
number Z=29.
(xiv) Describe Stark and Zeeman Effect?
(xv) Complete: 𝐻𝑒 + 𝐵𝑒 ⎯⎯⎯⎯⎯⎯ 𝐻 + ______
(xvi) Calculate the mass of an electron when
𝑒
𝑚⁄ = 1.7588 × 10 𝐶𝑜𝑙𝑢𝑚𝑏𝑠 𝑘𝑔 ?
(xvii) How will you prepare 10% 𝑤
𝑣⁄ urea solute in water?
(xviii) The concentration in terms of molality is independent of
temperature but molarity depends upon temperature. Why?
(xix) The freezed points are depressed due to the pressure of
solutes. Give reasons.
(xx) Calculate the oxidation number of N in 𝑁𝐻𝑂 and 𝑁𝑂 ?
(xxi) Na and K can displace hydrogen from acids but Pt, Pd and
Cu cannot. Comment on it.
(xxii) A porous plate or a salt bridge is not required in lead storage
cell. Give reason?
(xxiii) How the enzymes act as catalysts?
(xxiv) A particular catalyst is suitable for a particular chemical
reaction. Justify it.
(xxv) What is coordinate covalent bond? Give example?
(xxvi) Define electronegativity. Give its trend in periodic table?
(xxvii) What is the cause for the chemical change?
(xxviii) Differentiate between internal energy and enthalpy?
(xxix) Differentiate between spontaneous and non – spontaneous
reaction?
(xxx) Solubility of glucose increase in water by heating. Give
reason?
(xxxi) What factors influence the electron affinity?
(xxxii) What will the effect of volume change on the following
system at equilibrium state:
(a) PCl ( ) ⇌ PCl ( ) + Cl ( )
(b) 2SO ( ) + O ( ) ⇌ 2SO ( )
(xxxiii) How Kc predict the extent of chemical of a chemical
reaction?
SECTION-2
Note: Attempt any THREE questions
3. (a) Define liquid crystals and write its three uses?
(b) The combustion analysis of an organic compound shows it to
contain 65.44 % of carbon, 5.50% of hydrogen, 29.06% of oxygen.
What is the empirical formula for the compound? If molecular mass
of this compound is 110.15𝑔. 𝑚𝑜𝑙 . Calcuate the molecular formula
of the compound?
4. (a) Describe the Dalton’s law of partial pressure and write its two
applications?
(b) Derive the formula for calculating the energy of an electron in
nth orbit using Bohar’s model.
5. (a) Define the term electronegativity. Discuss its variation in the
periodic table?
(b) How ∆𝐻 can be determined by using bomb calorimeter?
Time: 02:40 Hours (Subjective Type) Marks: 68

3. Malik Xufyan 0313-7355727s
6. (a) Balance the equation by oxidation number method:
𝐾 𝐶𝑟 𝑂 + 𝐻𝐶𝑙 ⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯⎯ 𝐾𝐶𝑙 + 𝐶𝑙 + 𝐻 𝑂
(b)
7. (a) Define colligative properties. Explain elevation of boiling
point.
(b) Define the terms: (1) Rate of reaction (2) Order of reaction