This document contains a chemistry exam with multiple choice and short answer questions covering various chemistry topics. The exam includes 17 multiple choice questions testing concepts such as the mass of an electron, properties of isotopes, solvent extraction processes, plasma conductivity, water freezing, pseudo solids, photon velocity, wave properties, ethene geometry, hydrogen halide ionic character, enthalpy changes, pH calculations, antifreeze chemicals, azeotropic mixtures, electrolysis reactions, electrochemical cells, and reaction rate constants. It also includes short answer questions on mass spectrometry, hydrogen ion calculations, limiting reactants in reversible reactions, atomic mass units, filtration, thermometry scales, Boyle's law, critical gas temperatures, halogen properties

1. Malik Xufyan 0313-7355727
FAISALABAD BOARD 2009
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
The mass of 1 mole of electron is: 1.000 mg 0.55 mg 0.184 mg 1.673 mg
2 Isotopes differ:
Properties which
depend upon mass
Arrangement of
electrons in
orbital
Chemical
properties
The extent to
which they may be
affected in
electromagnetic
field
3
Solvent extaction is an equilibrium process and it is
controlled by:
Law of mass
action
The amount of
solvent used
Distribution law
The amount of
solute
4 Plasma is conductor of electricity: Bad Poor Good None
5 When water freezes at 0℃ its density decreases due to:
Cubic structure of
ice
Empty spaces
present in
structure of ice
Chane in bond
lengths
Change of bond
angles
6 Which is a pseudo solid: 𝐶𝑎𝐹 Glass 𝑁𝑎𝐶𝑙 All
7 The velocity of photon is:
Independent of its
wavelength
Depends on its
square
Equal to square of
its amplitude
Depends on its
wavelength
8 Properties of waves are: Wave length Wave number Frequency All
9 The geometry of ethene is: Etra hedral Trigonal plannar Linear V-shaped
10
Which of the hydrogen halides has the highest
percentage of ionic character:
HCl HBr HF HI
11
The change in heat energy of chemical reaction at
constant teperature and pressure is called:
Enthlapy change
Heat of
sublimation
Bond energy
Internal energy
change
12
The pH of 10 𝑚𝑜𝑙 𝑑𝑚 of an aqueous solution of
𝐻 𝑆𝑂 is:
3.0 2.7 2.0 1.5
13
Chemical used to protect a car by preventing the liquid
in the radiater from freezing is:
Phenol Ethylene glycol 𝐾𝑁𝑂 Methanol
14
An azeotropic mixture of two liquids boils at a lower
temperature then either of them when:
It is saturated
It shows positive
deviation from
Raoult’s law
It is meta stable
It shows negative
deviation from
Raoult’s law
15
The cathodic reaction in the electrolysis of dilute
𝐻 𝑆𝑂 with pt electrode is:
Reduction Oxidation Both A & B Neither A & B
16 Nelson cell downs cell are example of:
Electro chemical
cell
Galvanic cell Electrolytic cell None
17
The unit of rate constant is same as that of the rate of
reaction in:
First order
reaction
Second order
reaction
Zero order
reaction
Third order
reaction

2. Malik Xufyan 0313-7355727
SECTION-1
2. Attempt any 22 short questions: ( 44)
(i) What is the function of electrometer in separation of
isotopes in mass spectrometer?
(ii) What is number of 𝐻 ions in 9.8 g of 𝐻 𝑃𝑂 ?
(iii) Concept of limiting reactant is not applicable to the
reversible reactions. Explain it?
(iv) What is atomic mass unit? Give its value in grams.
(v) How we can run the process of filtration smoothly?
(vi) What are different scales of thermometry?
(vii) Define Boyle’s law. Give its expression?
(viii) What is the critical temperature of the gas? Give its
importance for the liquefaction for gases?
(ix) Melting and boiling points of halogens increase down the
group. Explain?
(x) What are London dispersion forces?
(xi) Evaporation is a cooling process. How?
(xii) Define vapour pressure of a liquid?
(xiii) How the cathode rays are termed as electrons?
(xiv) What are defects of Rutherford’s atomic model?
(xv) What is the function of principle quantum number?
(xvi) Give the electronic configuration of 𝐶𝑎 and 𝐵𝑟 ?
(xvii) Dipole movement of CO is 0.12 D but that of 𝐶𝑂 is zero.
Why?
(xviii) Define polar covalent bond with example?
(xix) Sigma bonds are more strong than pi bonds. Why?
(xx) How the electro negativity values vary in the periodic table?
(xxi) Define first law of thermodynamics. How it is represented?
(xxii) Define Enthalpy of neutralization by giving an example?
(xxiii) Define the term buffer capacity?
(xxiv) Justify the chemical equilibrium is dynamic in nature?
(xxv) What is Molality? Give its formula.
(xxvi) One molal solution of glucose is dilute as compared to one
molar solution. Justify?
(xxvii) Why the freezing point of the solution is always less than
the freezing point of the pure solvent?
(xxviii) Define electrolysis? Give an example.
(xxix) What do you mean by SHE? What is its use?
(xxx) Give electrode reaction in lead storage battery?
(xxxi) The radioactive decay is always a first order reaction. How?
(xxxii) What is the promoter or activator? Give an example.
(xxxiii) What are the characteristics of ideal solution?
SECTION-2
Note: Attempt any THREE questions.
3. (a) Discuss how empirical formula is determined by combustion
analysis?
(b) What are liquid crystals? Give their three uses in daily life.
4. (a) What is orbital hybridization? Explain the structure of 𝐶𝐻 on
the basis of 𝑆𝑝 hybridization?
(b) How ∆𝐻 can be determined by using glass calorimeter?
5. (a) Derive the radius of revolving electron in nth orbit of an
atom?
(b) 250 𝑐𝑚 of the sample of hydrogen effuses four times as
rapidly as 250 𝑐𝑚 of an unknown gas. Calculate molar mass of
unknown gas.
6. (a) Describe the electrolysis of molten NaCl and a concentrated
solution of NaCl.
(b) Study the equilibrium:
𝐻 𝑂( ) + 𝐶𝑂( ) ⎯⎯⎯⎯⎯⎯⎯⎯⎯ 𝐻 ( ) + 𝐶𝑂 ( ) when 1.0 mole of
stream and 1.0 mole of carbon monoxide are allowed to reach
erquilibrium 33.3% of equilibrium mixture is hydrogen. Calculate
value of 𝐾 .
7. (a) Define solubility curves and give its types with suitable
examples?
(b) Explain the effect of temperature on rate of reaction?
Time: 02:40 Hours (Subjective Type) Marks: 68