PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
CHAPTER #01
Periodicity And Classifications Of Elements
MCQ’S
1 .All noble gases fulfill octet rule except
(2011)
a. Ne
b. Ar
c. He
d. Xe
2. The elements of same group have the (2011)
a. same number of electrons
b. same number of valence electrons
c. same number of protons
d. same valence shell
3. The elements belonging to the same group in the periodic table are (2011)
a. Ca and Na
b.Ca and Be
c.Ca and Li
d.Ca and k
SHORT AND LONG QUESTIONS
1. State the modern periodic law. Explain how it removed the defects from Mendeleev’s system of
classification? (2012)
2. Write the valence shell electronic configuration of the following groups (2012)
i. IA andIB
ii.VA and VB
3. Write the electronic configuration, group, period and block of elements with atomic no 24 and 29(2011)
4. Define: i. electron population ii. periodicity of elements (2011)
5. Give advantages and defects of Mendeleev’s periodic table. Explain how modern periodic table is divided
into blocks; also write down the general electronic configuration of each block (2011)
6. Write the electronic configuration of Zn (atomic number=30) write its group, period and block (2010)
7. Give the valence shell electronic configuration of:
Representative elements (2008)
8. What is Mendeleev’s law? Why was Mendeleev’s law modified? Give at least two reasons (2008)
9. Discuss the long form of the periodic table on the basis of electronic configuration (2008)
10. Write down the block, period and group number of the following elements and there electronic configuration
(2008)
i. Ar (18) ii. P (15) iii. Br (35)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter #02 (Hydrogen)
MCQ’S
1. Water gas is produced by passing steam over red hot coke at: (2012)
a.800
b.900
c.600
d.1000
2. This metal forms super oxides: (2012)
a. Li
b. Be
c. K
d. Mg
3. Hydrogen shows the oxidation state: (2011)
a. zero only b.+1
c.-1
d. All of these
4 .The number of valence electrons in elements of II-A group is: (2010)
a.1
b.2
c.3
d.5
5. The crystalline solids which contain water molecules in there crystals are called: (2010)
a. hydrates
b. hydrides c. hydrolyzed d. electrolytes
SHORT AND LONG QUESTIONS
1. Give reason why ionic hydrides are called true Hydrides (2012)
2. What are binary compounds of hydrogen? Classify them. Explain covalent and polymeric hydrides? (2012)
3. Define and classify binary compounds of hydrogen. Explain ionic hydrides giving two preparations and two
reactions (2011)
4. Give points of resemblance of hydrogen with IA and VIIA groups of period table (2011)
5. Explain that position of hydrogen misfits in group IA of the periodic table(2010)
6. What is water gas give and method of its preparation? (2010)
7. Why is heavy water heavy? (2010)
8. Give reason why nascent hydrogen is more reactive then molecular hydrogen? (2011)
9. Write down five industrial preparations of hydrogen gas (2010)
10. Explain any two of the followings
i. isotopes of hydrogen ii. Preparation of atomic hydrogen III.POLYMERIC AND METALLIC hydrides
(2009)
11 .Discuss the position of hydrogen in the periodic table? (2008)
12. What is meant by binary compounds of hydrogen? Give chemical reactions of ionic or covalent hydrides
(2008)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter # 03
(S Block Element)
MCQ’S
1. NaOH is called caustic soda because: (2012)
a. it is used in soda water
b. it corrodes organic tissues
c. it reacts with chlorine gas
d .it reacts with fats to form soap
2. Brine is concentrated aqueous solution of: (2012)
a. sodium carbonate
b. sodium sulphate
c. alums
d. sodium chloride
SHORT AND LONG QUESTIONS
1. Give reason why Lithium and Beryllium differs from rest of the members of their respective group? (2012)
2. Give reason why plaster of Paris is used in making plaster coats and moulds? (2012)
3. Write equations of the followings (2012)
i. Aluminum reacts with aqueous NaOH?
ii. Lunar caustic is heated at 450oC?
4. Describe the preparation of chlorine gas by Castner kellner’s cell or Nelson cell?
(2012)
5. Complete the following equations (2012)
Cl2 +NaOH
CaSO4.H2O
Al2O3.H2O+NaOH
6. Give chemical formulas of the followings (2012)
i. Gypsum
ii. Suhaga
iii. Sandhur
iv. Starch
v. lunar caustic
vi. Molasses
7. What is lunar caustic? give equation for its prepration?(2011)
8. Give equations of the followings(2011)
i. Reaction of Na2CO3 with silica
ii. Reaction between sodium and oxygen
9. Write chemical formulas to the followings (2010)
I .Plaster of Paris
ii. Baking soda
iii. Oleum
iv .potash alum
10. How is sodium manufactured by Down’s process (2009)
11. Discuss the group trends in ‘P’ block elements with respect to (2009)
i. Ionization potential
ii. Electro negativity
iii. Hydration energy
iv. Melting point
12. How is sodium carbonate manufactured by ammonia –Solvay’s process? Draw flow sheet (2010)
13. Write chemical formulas to the followings(2009)
i. Blue vitriol ii. Oil of vitriol iii. Gypsum iv. Epsom salt v. Phitkari vi. Washing soda
14. Give reason why alkali metals are powerful reducing agents (2009)
15. Write a brief account on uses of bleaching powder (2009)
16. How is lunar caustic prepared? Give its uses? (2009)
17. What is the effect of heat on magnesium carbonate (2009)
18. Answer the followings in the manufacturing of soda ash by Solvay’s process (2008)
I .Name three raw materials used?
Ii .How ammonia is removed from the solution of ammonium chloride?
iii. Draw the floe sheet diagram
19. Write chemical formulas to the followings (2008)
i. bleaching powder
ii. Gypsum
iii. Tincal
l iv .carnalite
v. lead sesque oxide
vi. Potassium iodate
20. Give scientific reasons to the followings (2008)
i. atomic radii increases down the group in “p” block elements?
Metallic character increases down the group in “p” block elements?
21 Complete the equation (2008)
22. Give equation for the preparation of bleaching powder? (2011)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter# O4 (p Block Element)
MCQ’S
1. Kipp’s apparatus is used to prepare: (2011)
a. HCl
b.Cl2
c.H2S
d.SO2
2. Molecular formula of tincal is: (2012)
a.H3BO3
b.Na2B4O7.10H2O c.H2B4O7
d.Na2B4O7.7H2O
3. The substance which contains two or more metals is called: (2011)
a. alloy
b. polymer
c. allotrope
d. homologous
4. Bauxite ore is used for the extraction of: (2010)
a. aluminum
b. borax
c. boric acid
d. iron
5. Ammonal is a mixture of: (2010)
a. aluminium powder and aluminum nitrate
b. aluminium powder and ammonium sulphate
c. aluminium powder and sodium nitrate
d. aluminium powder and potassium sulphate
SHORT AND LONG QUESTIONS
1. What is aqua regia? How does gold dissolve in it? Give equation for the following (2012)+(2010)+(2008)
2. Give equation when zinc is treated with 90% conc .H2SO4? (2012)
3. The manufacturing 0f sulphuric acid by contact process. Draw the flow sheet diagram (2012)
4. Define ALUM write chemical formula of three alums (2012)
5. Complete the following equation (2012)
Zn+HNO3
6. GIVE equation why alkaline earth metal ions are more strongly hydrated then alkali metal ions (2011)
7. Give equation for the preparation of boric acid? (2011)
8. Give the structure and preparation of HNO3 with flow sheet diagram by Ostwald’s process. Write balanced
equation for the reaction of conc. and dil. HNO3 with CU (2011)
9. Give with diagram the extraction of pure Aluminium from pure aluminium oxide .what are ammonal and
aluminium benzoate? Mention there uses (2011)
10. Write the names and formulas of any four ores of aluminium. Give the refining of aluminium by Hooper’s
electrolytic method (2010)
11. Why the viscosity and boiling point of H2SO4 and high (2010)
12. Complete the following reasons (2010)
i.NaB4O7+H2SO4
II.Zn+HNO3
III.HCOON+H2SO4
13. Write the chemistry of boric acid?(2010)
14. Describe the manufacturing of H2SO4 by contact process. write the conditions for getting a good yield of
SO3.draw the flow sheet diagram (2010)
15. Give the composition and uses of two alloys of aluminium (2010)
16. Complete and balance the following reactions (2009)
i. CaSO4.H2O
II. H3BO3
III. Al2O3.nH2O+C+N2
IV. Al+ NaOH +H2O
17. How HNO3 is manufactured by Ostwald’s method. Draw the diagram (2009) + (2008)
18. Give reasons of the following (2009)
i. Sulphuric acid is a sulphonating agent
ii.HNO3 is an oxidizing agent
19. Write short note on Borax (2009)
20. Define Allotropy and describe the structure of diamond (2008)
21. Name four ores of Aluminium (2008)
22. How is bauxite ore purified by Serpek’s process (2008)
23 .Mention the refining of Aluminium by Hoope’s method (2008)
24 .Draw the structure of HNO3 in vapour and solid phase with bond lengths and bond angles(2008)
25. Write the Auto oxidation reduction of chlorine (2008)
26. Complete the following reaction (2008)
i.C12H22O11+H2SO4
II.K2Cr2O7 +H2SO4
27 .Give with diagram the extraction of pure alluminium form pure aluminium oxide. what are ammonal and
aluminium bronze mention there uses? (2011)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter#05 d Blocks Elements
MCQ’S
1. The process of covering iron sheets by layer of zinc is known as: (2012)
a. tempering
b.tin plating
c. annealing
d. galvanizing
2. The number of elements in each lanthanide and actinide series is: (2012)
a.14
b.10
c. 2
d.32
3. In K2Cr2O7 the oxidation state of Cr is: (2010)
a.7
b.6
c.5
d.4
4. The harmful and undesirable reaction of metals, when exposed to atmosphere or any chemical agent, is
known as: (2010)
a. corrosion
b. allotropy
c. cracking
d. electroplating
SHORT AND LONG ANSWER QUESTIONS
1. Why the electronic configuration of (Cr) 4s1, 3d5 instead of4s2, 3d4.While that of (cu) is 4s1, 3d10 instead
of4s2, 3d9 ? (2012)
2. Write the IUPAC names of the following complexes (2012)
i. [Fe(NO2)6]-3
II.[Cr(en)2Cl2]Cl
3. Complete the given equation and give IUOAC names of the complexes formed (2012)
i.CUSO4+NH3
II.AgNO3+NH3
4. What are outer and inner transition elements, how many series of each of them are present in periodic
table? Also write the names of inner transition series (2012)
5. How is pure copper obtained from roasted pyrite ore?(2012)
6. Water and ammonia acts as legends but hydronium ion and ammonium ion do not give reason? (2011)
7. Write the reaction b/w pot .dichromate and pot. Hydroxide? (2011)
8. Name the complexes by IUPAC system
i.[Ni(CO)4]
II.NH4[CrCNCS)4.(NH3)]
III. Fe(CN)6]-3
9. Write a note on any two of the followings (2012)
i. Lead pigments ii. Corrosion and its prevention
10. Write down the IUPAC names of the followings (2010)
i. K3[Fe(CN)6] II.[Co(NH2-CH2-CH2-NH2)3]Cl3
11 .Define legends .give the classification of legends bases upon the number of co ordination atoms with
examples (2010)
12. Write a note on any one of the followings (2010)
i. photography
ii.silvering of mirror.
13. Complete the following reactions (2010)
K2CrO7+H2SO4
14. How copper is obtained from matte? Explain the method of its refining by electrolysis. draw the diagram
(2010)
15. Write a note on the followings
i. silvering of mirror
ii. Corrosion
iii. Lead pigments
16. Define a mineral and ore. how is copper extracted from its sulphide ore? (2009)
17. Describe the following properties of transition elements (2009)
i. variable oxidation state
ii. Colour of complexes
18. Give IUPAC names of the followings
i. Na3[CO(NO2)6]
II.K3[Cr(H2O)Cl5
iii. Ni (Co)4 iv.K4Fe(CN)6
19. Complete and balance the following reaction (2008)
K2CrO7+H2SO4
20. GIVE IUPAC names of the following (2008)
i.[Co(en)2]+2 ii.Na3[CO(NO2)6] III.[Zn(NH3)4]SO4 IV.[Ni(Co)4]
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter#06
Introductions To Organic Chemistry
MCQ’S
1. The compounds 1-butene and 2-butene are: (2011)
a . chain isomers
b. metamers
c. functional group isomers
d. position isomers
2. Carbon atom of carbonyl group is hybridized as: (2011)
a. sp
b.sp2 c.sp3
d.dsp
SHORT AND LONG QUESTIONS
1. Differentiate b/w the following (2012)
i. Saturated and unsaturated hydrocarbons
ii. Aliphatic and aromatic hydrocarbons
2. Define isomerism give its types with examples (2012)
3. Write a note on allotropic forms of carbon (2011)
4. Define the followings with examples (2010)
i. polymerization ii. Homologous series
5. Write a note on isomerism (2009)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter#07 Chemistry Of Hydrocarbons
1. The gas is produced by treating ethene with sulphur monochloride: (2012)
a. marsh gas
b. tear gas
c. mustard gas
d. laughing gas
2. This gas is used in welding: (2012)
a. methane
b. ethene
c. ethyne
d. ethane
3. Molecular formula of chloroform is: (2011)
a.CH3Cl
b.CHCl3
c.CH
d.CCl4
4. A carbon having positive charge is called: (2011)
a. carbonium ion
b. hydroxide ion
c. carban ion
d. halide ion
5. Ethylene is used in: (2011)
a. anesthetic b. ripening of fruit
c. preparing of mustard gas
d. all of above
SHORT AND LONG QUESTIONS
1. Write equations for the followings conversions (2012)
i. Benzene to Nitro benzene ii. Ethyne to Ethanol iii. Ethanal to Ethanoic acid
2. Give the reactions of benzene with chlorine(2012)
i. in presence of Lewis acid catalyst
ii. in presence of sunlight
3. Write the structural formula of di vinyl acetylene (2012)
4. Draw and explain the orbital structure of ethyne (2012)
5. Give chemical formulas to distinguish b/w ethene and ethyne (2012)
6. Give equations for the reaction b/w sodium benzoate and soda lime (2012)
7. How does chlorine reacts with methane in presence of sunlight (2012)
8. What happens when ethyne is reacted with iodine in presence of ethanol (2012)
9. What is orientation of benzene? Explain orientation of mono substituted benzene? Name ortho, meta and
par directing groups (2012)
10. Explain electrophilic substituation in benzene with reference to (2012)
i. Friedal-crafts acylation
ii. Sulphonation reaction
11 .Draw and explain orbital structure of ethene (2011)
12. Give equation for the preparation of the followings (2011)
i. Acetaldehyde from Acetylene
13. Give equation for the preparation of the following organic compounds (2011)
i. Ethyne from Ethene
14. Give equation for the following reactions (2011)
i. Cannizzaro’s reaction ii polymerization of Acetaldehyde iii. Combustion of ethane iv. Oxidation of benzene
15. Explain the structure of benzene by molecular orbital treatment along with orb ital structure. Benzene acts
as saturated and unsaturated compound, justify the statement by equation (2011)
16. Draw the orbital structure of ethyne molecule; briefly explain the nature of hybridization in carbon and their
bonds (2010)
17. Give equations for the preparation of the followings (2010)
i. ethane from methyl iodide ii. Benzene from phenol iii. Ethyne from calcium carbide
18. Write nitration in benzene along with mechanism (2010)
19. Explain the acidity of ethyne with the help of two chemical reactions (2010)
20. Give the KEKULE’S structure of benzene and write the objection against it. How was this objection
removed by kekule’s (2010)
21. Complete the following chemical process (2010)
Ethyne+ nascent oxygen
22. Define the followings with examples and give two chemical tests to identify saturated and unsaturated
compounds (2009)
23. Starting from benzene, how will you prepare the following (2009)
i. P.Nitrobenzoic acid ii.m.nitrotoulene iii. Benzoic acid iv. Acetophenone
24. Draw the structure of benzene as suggested by (2009)
i. Kekule’s
ii. Armstrong
iii. Bayer
25. What is the action of heat on methane (2008)
26. What objection is raised on kekule’s structure of benzene and how is it defined (2008)
27. What is electrophilic substitution reaction .Give an example of halogenations in benzene with full
mechanism in presence of catalyst (2008)
28. Write down the equation for the preparation of (2008)
I .Ethane from vicinal dichloride ii. Ethane from methyl iodide in presence of sodium meta
29. Complete the following equations (2008) i. when ethyne is heated in red hot tube ii. Reaction of ethene
with bromine gas in presence of CCl4
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter #08 Alkyl Halides
MCQ’S
1. Grignard reagent reacts with ketone to give: (2012)
a. 1°-alcohol
b.2°-alcohol
c.3°-alcohol
d. phenol
2. General formula of alkyl halides is: (2011)
a. CnH2nX
b.CnH2n-x
c.CnH2n+x
d. CnX
SHORT AND LONG QUESTIONS
1 .What are alkyl halide? Classify them with one example of example of each(2012)
2. Outline the step reaction mechanism of the following:
SN1 reaction b/w NaCN and 2-chloro-2-methyl propane (2012)+(2009)
3. How is Grignard’s reagent prepared? How the following can be prepared from Grignard’s reagent
i. acetic acid
ii. Ethyl alcohol
iii. Propane (2011)
4. What is meant by elimination reaction? Example the mechanism of uni-molecular elimination reaction (E1) (2010)
5. Explain the mechanism of SN1 reaction and SN2 reaction with examples (2009)
6. What is nucleophilic substitution reaction? Give an example (2009)
7. What are alkyl halides ?how they are classified(2009)
8. Give the reason of the followings (2008)
i. Alkyl halides halides give SNI mechanism in the presence of polar solvent
ii. E2 reaction is of 2nd order
9. Alkyl reason halides behave as nucleophilie in Grignard’s reagent (2008)
10. Complete the following equation (2008)
Cl-CH2-CH2-Cl+KOH
10. Write the chemical equation to show that products will be formed when CH3MgCl reacts with (2010)
i.CO2
ii. Acetone
iii. water
iv. methyl chloride
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter#09
Carbon Compounds With Oxygen Containing Functional Groups
1. The functional group present in cresol: (2012)
a. phenolic
b. carboxylic
c. ketonic
d. aldehydic
2. Dimethyl ether and ethyl alcohol are: (2012)
a. functional group isomers
b. metamers
c. position isomers
d. cis –trans isomers
3. In Tollen’s test ,the end product is: (2012)
a. silver mirror
b. white ppt
c. red ppt
d. yellow ppt
4. Methylatde sprit is a mixture of :(2011)
a. methyl alvohol and HCL
b. methyl alcohol and methane
c. methyl alcohol and ethyl alcohol
d. ethyl alcohol and HCl
5.Tollen’s reagent is: (2011)
a. ammonical cuprous oxide
b. ammonical cuprous chloride
c. ammonical silver bromide
d. ammonical silver nitrate
1. Write the stricture formulas of the following (2012)
i. Hydroquinone
ii. Ethyl –ter-butyl ether
2. Give equation of the followings (2012)
i. Reaction of acetone with acidified K2Cr2O7
II. Reaction of phenol with conc.HNO3
3. What is fermentation ?how is ethyl alcohol obtained by fermentation of (2012)+(2010)
i. starch
ii. Molasses
4. What happened when(2012)
i. methanol is treated by phenyl hydrazine ii. phenol is treated with red hot zinc dust
5. Distinguish by simple chemical test (2011)
i. aldehyde and ketone ii.alkene and alkynes
6. Give equation for the preparation of the followings (2011)
i. ethene from ethyl alcohol
ii. oxalic acid from ethyne
iii. benzene from toluene
7. Define functional group .Name the functional group in the following compounds (2011)
i.C2H4COCl
ii.CH3CONH2
8. Give the electronic structure of acetone and silver acetaldehyde (2011)
9. What are phenols? Classify them (2011)
10. Give equation for the preparation of the following compound (2011)
i. DI ethyl ether from ethanol ii. Methanol from water gas iii .Acetone from acetic acid
iv. methanal from methanol
v. ethanoic acid from ethanol
vi. Ethanol from glucose
11. Give the equation for the following reaction (2011)
i. hydrolysis of ethyl acetate in basic medium
ii. Reduction of acetone
12.Give equation for the preparation of ethene from ethyl alcohols(2010)
13. What happens when the following reaction takes place (2010)
i. methanal is reacted with TOLLEN’S reagent
ii. acetone is heated with iodine and sodium carbonate
iii. hydrolysis of ethyl acetate in basic medium
iv. Acetic acid is heated with ethyl alcohol in presence of conc...Sulphuric acids
14. Write down preparation of phenol by Down’s process (2010)
15.Complete the following chemical process(2010)
i.NaOH+CH3COONa
ii. HCHO + NaOH
III. When Calcium acetate is heated by dry distillation
16. Define fermentation? How is ethyl alcohol prepared by the fermentation of starch? Explain how ethyl
alcohol is made unfit for drinking (2010)
17. down the structural formulae of the followings (2009)
i.2-3-dimethyl-3-pentanol
ii. resorcenol
iii.3-ethoxy hexane
iv. alpha napthol
v. ethyl ethanoate
18. Complete the following equation (2009)
i.CH3COOC2H5+NaOH
II.C2H5OH+SOCl2
iii.CH3-CH2-OH +PCl5
iv.C2H5 Cl+Na
v.CH3MgBr+H2O
19. Write a short note on ether (2008)
20. Write down the chemical equation for the preparation of acetamide from acetyl chloride (2008)
21. Why ethyl acetate is used in plasticizers (2008)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
22. What are alcohols? Classify monohydric alcohols (2008)
23. How is methyl alcohol prepared from water gas (2008)
24. Write down the methods for the preparation of acetone and its two chemical properties giving chemical
reactions (2008)
25. Write the main constituents of vinegar give its reaction with ethanol (2008)
26. Which reagent is used to change methyl iodide into followings? Write the chemical equation(2008)
i.ethyl methyl ether
ii. Propaonic acid
27. Complete the following equation
Phenol+ nitric acid
25oc
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter # 10 Chemistry of Life
MCQ’S
1 .Milk sugar is sugar is: (2012)
a. glucose
b. fructose
c. lactose
d. sucrose
2. The functional group is present in oil and fat: (2012)
a. carboxylic
b. alcoholic
c. ester
d. aldehydic
3. Cholesterol, colic acid And progesterone are: (2012)
a. amino acids
b. steroids
c. proteins
d. enzymes
4. The human body stores a part of glucose in liver in form of : (2010)
a. glycogen
b. amylase
c. amylopectin
d.cellulose
SHORT AND LONG QUESTIONS
1. What are Zwitter ions? (2012)
2. What are vitamins? Define and classify: explain vitamin B-complex and vitamin C(2012)+(2011)+(2010)
3. Explain specification of oil and fat. Write with the help chemical reaction and. write the names of the
products formed (2010)
4. What are vitamins? Name the sourses, diseases caused by deficiency of vitamins? How they are classified
(2010) +(2009)
5. Differentiate b/w a reducing and a non reducing sugars (2009)
6. What are enzymes (2009)
7. Differentiate b/w fat and oil (2009)
8. What is the role of amino acids in human body (2008)
9. What are enzymes? Explain the effect of various factors which influence the rate of enzyme (2008)
10. What are vitamins? Discuss the diseases caused by the deficiency of vitamin D (2009)
PAST PAPER (XII KB)
SUBJECT: CHEMISTRY
Chapter # 11 Chemical Industries In Pakistan
1. Write a note on any two of the followings (2011)
i. glass
ii. Detergents
iii. Plastics
2. What are fertilizers? name two nitrogenous and one phosphate fertilizer along with their methods of
preparations (2010)
Write a note on the followings (2009)
I. phosphatic fertilizers
ii. Paints
iii. Detergents
4. Write a note on (2008)
i. plastics
ii. Detergents
NOTE: Write IUPAC names to the following organic compounds (2012-2008)