Download PAKISTAN SHIPOWNERS` GOVERNMENT COLLEGE,

DATE:. .03.2017
9:00 am to 9:20 am
PAKISTAN SHIPOWNERS’ GOVERNMENT COLLEGE,
NORTH NAZIMABAD, KARACHI
PRELIMINARY EXAMINATION, 2017
CHEMISTRY PAPER-II
(Science Pre-Engineering & Pre-Medical Group)
SECTION – “A”
(MULTIPLE CHOICE QUESTIONS)- (M.C.Qs)
CODE NO: CHM-II
Max Marks: 17
Time: 20 Minutes
NOTE: (i) This section consists of 17 part questions and all are to be answered. Each
question
carries one mark.
(ii) Do not copy down the part questions in your answer book. Write only the
answer in full against the proper number of the question and its part.
(iii) The code number of your question paper is to be written in bold letters in the
beginning of the answer script.
1. Choose the correct answer for each from the given options:
(i) This one of the following has the highest heat of hydration;
* Mg+2
* Ca+2
* Be+2
* Na+1
(ii) The process of covering iron sheet with a layer of zinc is known as
* Galvanizing
* Tin plating
* Annealing
* Electroplating
(iii) The Ore of Potassium is
* Dolomite
* Cryolite
* Bauxite
* Carnallite
(iv) Kipp’s apparatus is used to prepare
* SO2
* H2 S
* HCl
* Cl2
(v) The atomic number of an element, belonging to 3rd period and group V-A is
* 7
* 13
* 15
* 23
(vi) Among the following, this has the smallest ionic radius;
* Na+1
* Mg+2
* Al+3
* Cl-1
(vii) The first organic compound prepared in the laboratory was
* Acetic acid
* Urea
* Glucose
* Aldehyde
(viii) The I.U.P.A.C name of the compound H2C═CH−CH(CH3)2
* 1-Isopropyl ethylene
* 3-Methyl-1-Butene
* 2-Vinyl propene
* 2-Methyl-3-pentene
(ix) Ethyl magnesium iodide reacts with methyl alcohol to form
* Ethane
* Propane
* n-Butane
* 2-Bromo butane
(x) This group is meta-directing
* -R
* -OR
* -COOR
* -X
(xi) The non-Protein part of Enzyme is called
* Substrate
* Activator
* Co-enzyme
* Apoenzyme
(xii) Trimer of Formaldehyde is known as
* Meta formaldehyde
* Trioxymethylene
* Acetone
* Trionane
(xiii) The functional group in RSH is;
* Alcohol
* Carboxylic acid
* Ether
* Thioalcohol
(xiv) Hybridization in the carbon atom of carbonyl group is;
* sp
* sp2
* sp3
* dsp2
(xv) This is animal starch
* Glycogen
* Amylose
* Amino acid
* Cellulose
(xvi) This imparts red colour to glass
* Cr2O3
* CuO
* CoO
* ZnO
(xvii) E.D.T.A is this type of ligand
* Bidentate
* Tetradentate
* Pentadentate
* Hexadentate
DATE: .03.2017
9:20 am to 12:00 pm
PAKISTAN SHIPOWNERS’ GOVERNMENT COLLEGE,
NORTH NAZIMABAD, KARACHI
PRELIMINARY EXAMINATION, 2017
CHEMISTRY PAPER-II
(Science Pre-Engineering & Pre Medical Groups)
Max Marks: 68
Time: 2 Hours 40 Minutes
SECTION-“B”
(SHORT- ANSWER QUESTION)
NOTE: Attempt any FIVE questions from Inorganic Chemistry and FIVE questions from
Organic Chemistry. All questions carry equal marks.
Marks: 40
INORGANIC CHEMISTRY
2.
(i) Describe the merits and demerits of Mendeleev,s periodic table.
(ii) Write down the I.U.P.A.C names of the following.
* [ Fe(NO2)6 ] -3
* K3[ Fe(H2O)Cl5 ]
* [ Pt(NH3)4Cl2 ]Br2
* [ Co(NH3)3(NO2)3 ]
(iii) Write a note on any two of the following.
* Corrosion and its prevention
* Photography
*Glass
(iv) a) Write the electronic configuration of the following elements and write their name, group, period and
block.(Any two)
* Cu
* Cr
*V
* As
b) Describe the term Alum. Write the chemical formula of any three Alums.
(v) Describe the manufacture of HNO3 by Ostwald’s method. Draw the diagram.
(vi) a) What is Water Gas? Give two method of its preparation.
b) Write Auto-Oxidation and Reduction of Chlorine.
(vii) a) Write a note on complex Hydrides.
b) Write the Chemical formula of the following.(Any four)
* Oleum
* Bleaching powder
* Hypo
* Lunar Caustic
* Fluorspar
* Tincal
(viii) Give Reason:
* Plastic sulphur is elastic.
* Alkaline earth metal ions are more strongly hydrated than alkali metal ions.
* Boiling point and Viscosity of H2SO4 are high.
* Blue crystals of copper sulphate turn white on heating.
ORGANIC CHEMISTRY
3.
(i) Define the following.(Any four)
* Catenation * Cracking
* Homologous Series
* Octane number
*Acid value
(ii) a) Define Isomerism. Explain the types of Isomerism with examples.
b) Explain why Alkanes are less reactive than Alkenes?
(iii) a) Write a note on polymerization and its types.
b) Distinguish by simple chemical test,
*Aldehyde and Ketone
* Ethene and Ethyne
(iv) Write a note on any two of the following.
* Amino acids
* Carbohydrates
* Lipids
* Plastic
(v) What happens when the following reaction take place?
* Ethane burns in air.
* Sodium Benzoate is treated with Caustic soda.
* Ethyl alcohol react with phosphorus penta chloride.
* Ethyl acetate hydrolysed in basic medium
(vi) Give the equations for the preparation of the following.
* Acetone from Calcium acetate.
* Benzene from Phenol.
* Acetal from Methanal.
* An Oxime from formaldehyde.
(vii) a) What is Elimination reaction? Write the comparison between E 1 and E2 reactions.
b) Write a short note on any One of the following.
* Fertilizers
* Detergents
(viii) Write the structural formulas of the following.
* 2, 4, 6-Trinitrophenol
* Tertiary butyl ethanoate
* Acetophenone
* Triphenyl amine
SECTION-“C”
(DETAILED-ANSWER QUESTIONS)
Marks: 28
NOTE: Attempt any two questions-One question from Inorganic Chemistry and the other from
Organic Chemistry. Both questions carry equal marks.
INORGANIC CHEMISTRY
4. a) How is Sodium carbonate prepared by Ammonia-Solvay process? Draw the flow sheet diagram.
b) What is Aqua Regia? How does it dissolve gold? Explain with equations.
c) What is Allotropy? Describe different allotropic form of Sulphur.
d) Describe the manufacture of Sulphuric acid H2SO4 by Contact process. Draw the flow sheet diagram
5. a) What is metallurgy? Explain the extraction of 99.99% pure aluminium from bauxite ore containing SiO 2
and Fe2O3 as impurities.
b) Draw the structure of HNO3 in vapour phase and solid phase with bond lengths and bond angles.
c) Describe the Extraction of Sodium by Down’s process. Draw the diagram.
d) What are d-block elements? Discuss the following characteristics of Transition elements.
* Variable oxidation states
* Colour
* Catalytic property
* Magnetic properties
OR
Give equations for the following;
* Reaction of ferric oxide with aluminium.
* Reaction of litharge with sodium chloride.
* Action of heat on blue vitriol
* Reaction of sodium carbonate with silica
ORGANIC CHEMISTRY
6. a) Explain the following reaction of Benzene.
* Acylation by Friedel-crafts reaction
* Nitration of Benzene
b) Define SN reactions. Explain the mechanism of SN1and SN2 reaction with examples.
c) What are vitamins? How are they classified? Write the names, sources and the diseases caused by
their deficiency.
d) Discuss the orbital structure of Acetylene in detail.
7. a) Define Fermentation. How is Ethyl alcohol prepared by the fermentation of Starch? What do you
mean by Methylated Spirit?
b) Discuss the structure of Benzene in term of Molecular Orbital Theory. Justify that benzene act as
a saturated and unsaturated compound.
c) What is Grignards Reagent? Prepare 2-propanone and Tertiary butyl alcohol from Grignards reagent.
d) Name the following by I.U.P.A.C system.
O O
║ ║
* CH2 ═ CH − CH ═ CH − C ≡ CH
*
*
*
OH
* HO−C−C−OH
*
OH
OH
│
│ │
* CH2−CH−CH2
*