Multan Board 2017
Chemistry PART - II
Time: 30 Minutes
Group-I
Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B, C and D to each question are given. Which answer you consider correct, fill the corresponding circle A, B, C and D given in front of each question with Marker or pen ink on the answer sheet provided.

• _____is used in the manufacture of synthetic fiber.

1. Formic acid
2. Oxalic acid
3. Amino acid
4. Acetic acid

• The reaction between fat and NaOH is called:-

1. Esterification
2. Hydrogenolysis
3. Fermentation
4. Saponification

• Phosphorus helps the growth of:-

1. Root
2. Leave
3. Stem
4. Seed

• ______is a secondary pollutant

1. Carbonic acid
2. CO₂
3. SO₂
4. CO

• Keeping in view the size of atoms, order is correct one.

1. Mg >Sr
2. Ba > Mg
3. Lu >Ce
4. C >

• The mineral CaSO_A.2H₂O has the general name:-

1. Gypsum
2. Dolomite
3. Calcite
4. Epsom salt

• _____element is not present abundantly in earth's crust.

1. Silicon
2. Aluminum
3. Sodium
4. Oxygen

• Oxidation of NO in air produces:-

1. N₂O
2. N₂O₂
3. N₂O₄
4. N₂O₄

• The anhydride of HCO₄ is:-

1. CO
2. CC₂
3. CO₃
4. Ce₂O₇

• Coordination number of in is:-

1. 2
2. 4
3. 1
4. 6

• Ether shows the phenomenon of:

1. Position Isomerism
2. Functional group isomerism
3. Metamerism
4. Cis - trans isomerism

• Vinyl acetylene combines with HC to for Polyacetylene

1. Polyacetylene
2. Benzene
3. Chloroprene
4. DivinylAceatylene

• _____acid can be used as a catalyst in Friedal-Craft's reactions.

1. AC ₃
2. HNO₃
3. BeC ₂
4. NaC

• ______is not a Nucleophile.

1. H₂O
2. H₂S
3. BF₃
4. NH₃

• According to Lewis concept, ethers behave as:-

1. Acid
2. Base
3. Acid as well as a base
4. Electrophile

• The carbon atom of a Carbonyl group is:-

1. sp hybridized
2. sp² hybridized
3. sp³ hybridized
4. dsp² hybridized

• Acetic acid Is manufactured by:-

1. Distillation
2. Fermentation
3. Ozonolysis
4. Esterification

SUBJECTIVE PART
SECTION B

Q 2. Write short answers to any EIGHT (8) questions.

1. Define Hydration Energy. Give one example.
2. Why diamond is non-conductor of electricity while graphite is a good conductor?
3. What happens when the following compounds are heated? (a) LiOH (b) Mg (NO₃)₂
4. Which two major problems am faced during working of diaphragm cell?
5. Write down chemical formula of Colemanite and Bauxite.
6. Why are liquid Silicones preferred over Ordinary Petroleum Oil?
7. Give two chemical reactions to prove that NO3 is an Oxidizing Agent.
8. Write two precipitation reactions of Sulphuric Acid.
9. Why group elements are called Non-typical Transition elements?
10. What are Ligands? Give two examples.
11. What is Ecosystem?
12. How does increasing concentration of detergents affect the aquatic life?

Q 3. Write short answers to any EIGHT (8) questions.

1. What is Teflon? Give its uses.
2. Why the Oxyacids of Chlorine are stronger than Oxyacids of Bromine?
3. Butane does not show Cis-trans isomerism but 2 - Butane does. Justify this statement.
4. Define the terms:- (a) Emotional distillation (b) Hybridization
5. Write chemical equations for preparation of propene from,
   (a) CH₃CH₃CH₃Br
   (b) CH₃CH₂CH₂OH
6. What is Polymerization? How high quality polyethylene is obtained from Ethene?
7. Define Resonance and Resonance Energy.
8. What are objections to Kekule's formula?
9. Justify the given order of reactivity on the basis of bond energy
10. Complete the following reactions:-
    (a) CH₃CH₂ - Br + CH₃ O^-
    (b) CH₃CH₂ -Br + CH₃COO^- Na⁺
11. What is meant by denaturing of Alcohol?
12. Give reactions of Phenol with:-

• Bromine water (b) Cone H₂SO_a

Q 4. Write short answer to any six (6) question

1. Convert Acetaldehyde to 1.1 - Diethoxyethane.
2. Convert Acetone acetic Acid.
3. Draw the structural formula of (a) Epichlorohydrin (b) Diphenylol Propane
4. What is condensation polymerization? Give a reaction.
5. Draw the structural formulas of (a) Valerie acid (b) Phthalic acid
6. What are Amino Acids'? Give two examples.
7. What are Carbohydrates? How are they classified?
8. What are Fertilizers? Why are they needed?
9. What is the composition of Lime and Silica of good Cement'?

SECTION C

Note: Attempt any THREE questions.

Q 5.

1. Explain the position of Hydrogen in 1^st a group of periodic table with two similarities and two differences.
2. Describe four peculiar behaviour of Beryllium.

Q 6.

1. Explain Bessemer's Process for manufacturing of Steel with the help of diagram.
2. Where does Ozone exist in atmosphere? What is Ozone hole? Write role of CFCs in destroying ozone.

Q 7.

1. Define sp² Explain the structure of Ethane on the basis of sp² hybridization.
2. What are S_N reactions? Explain S_N reactions in detail.

Q 8.

1. How will you make the following conversions?
   (i) N-prophyl bromide into propane
   (ii) Propanoic acid into Ethane
   (iii) Ethane into Methane
   (iv) 2 - Butyne into Cis - 2 – Butene
2. What types of Aldehydes give Cannizzaro reaction? Give its mechanism.

9.

1. Describe Nitration and Sulphonation of Benzene with Mechanism.
2. Explain the following terms using Ethyl Alcohol as an example:-
   (i) Oxidation
   (ii) Dehydration
   (iii) Esterification
   (iv) Ether formation

Multan Board 2017
Chemistry PART - II
Time: 30 Minutes
Group 2
Note: Write answers to the questions on the objective answer sheet provided. Four possible answers A, B, C and D to each question are given. Which answer you consider correct, fill the corresponding circle A, B, C and D given in front of each question with Marker or pen ink on the answer sheet provided.

• ______is the strongest acid.

1. HCO
2. HCO₂
3. HCO₃
4. HCO₄

• _____is a typical transition element

1. Sc
2. Y
3. Ra
4. Co

• A double bond consists of:-

1. Two Sigma bond
2. One Sigma and one pi bond
3. One Sigma and two pi bond
4. Two pi bonds

• Dichloro Ethyl Sulphide is commonly known as:-

1. Mustard gas
2. Laughing gas
3. Phosgene gas
4. Bio — gas

• Benzene cannot undergo:-

1. Substitution reactions
2. Addition reactions
3. Oxidation reactions
4. Elimination reactions

• Elimination bimolecular reactions involve:-

1. First order kinetics
2. Second order kinetics
3. 3^rd order kinetics
4. Zero order kinetics

• Alcohol obtained by fermentation never exceeds:-

1. 14%
2. 10%
3. 16%
4. 95%

• Ketones are prepared by Oxidation of:-

1. Primary Alcohol
2. Secondary Alcohol
3. Tertiary Alcohol
4. All of these

• Ace amide is prepared by:-

1. Heating Ammonium Acetate
2. Heating Methyl Cyanide
3. Heating of Phthalic Acid
4. Heating Ethyl Acetate

• Polypeptide has molecular mass up to:-

1. 000
2. 20,000
3. 1000
4. 10

• ______polymers is a synthetic polymer.

1. Animal fat
2. Starch
3. Cellulose
4. Polyester

• Ammonium Nitrate fertilizer is not used for____ crop.

1. Cotton
2. Wheat
3. Sugar cane
4. Paddy Rice

• Newspaper can be recycled again and again by____ times.

1. 2
2. 3
3. 4
4. 3

• Mark the correct statement:-

1. Metallic Character decreases along a period
2. Metallic Character increases along a period
3. Metallic Character increases down the group
4. Metallic Character remains the same down me group

• ______element is deposited at the Cathode during the electrolysis of brine in Nelson Cell

1. H₂J
2. Na
3. Ct₂
4. O₂

• Aluminum Oxide is:-

1. Acidic Oxide
2. Basic Oxide
3. Amphoteric Oxide
4. None of these

• _____Catalyst is used in the Contact Process.

1. Fe₂O₃
2. V₂O₅
3. SO₃
4. Ag₂O

SUBJECTIVE PART
SECTION B

Q 2. Write short answers to any EIGHT (8) questions.

1. Define Atomic Radius. Why atomic radii of A group elements increases in a group?
2. Hydration energies of the following ions are in order. Explain A ⁺³> Mg⁺²>Na⁺
3. What is the importance of Sulpher for Plants?
4. Why NaOH aqueous solution is more basic than LiOH?
5. Aluminum sheets are said to be corrosion free. Why?
6. Give peculiar behavior of Carbon with IVA group elements. Give two points of differences.
7. What is the effect of Temperature on N₂O₄?
8. Mention allotropic forms of VIA group elements.
9. What are Substitutional Alloys?
10. Under what conditions does Aluminum corrode?
11. Flow recycling of plastic is done by a process transformation?
12. What are harmful effects of Chlorination of Water?

Q 3. Write short answers to any EIGHT (8) questions.

1. Why HF is weaker acid than HH?
2. What are Disproportionation Reactions? Give an example.
3. 2 - Butene shows Geometrical isomerism but I - Butane does not show. Why?
4. What are Alicyclic Compounds? Give two examples.
5. How Alkane can be prepared by Wolf Kushner’s Reaction?
6. How Ethene can be converted into Ethylene Glycol?
7. What happens when Benzene is heated with cone? H₂SO_A at 80^o C?
8. Give Mechanism of Nitration of Benzene.
9. How tetraethyl lead can be prepared from Alkyl Halides?
10. Which factor decides the reactivity of Alkyl Halides?
11. Write the structural formulas of (a) Lactic Acid (b) Tartaric Acid
12. What is meant by Denaturing of Alcohol?

Q 4. Write short answers to any SIX (6) questions.

1. How will you distinguish between Methanol and Ethanol?
2. Write general mechanism of the reactions of Ammonia derivatives with carbonyl compounds.
3. Write the structural formula of Phthalic Acid and Masonic acid.
4. Define essential and Non-essential Amino Acids.
5. Define Copolymers with one example.
6. How are Proteins denatured?
7. What is the effect of temperature on Enzyme Activity?
8. What are Macro-nutrients? Write their names.
9. What are the reactions taking place between one to seven days in setting of Cement?

SECTION C

Note: Attempt any THREE questions.

Q 5.

1. Explain Sixth and 7^th period of Periodic Table.
2. How & why Beryllium differs from its group members?

Q 6.

1. Explain open hearth process for the manufacture of Steel.
2. Why is Ozone layer depleting? What will happen when concentration of Ozone will be decreased?

Q 7.

1. Write a short note on Reforming?
2. Give two chemical reactions which are used for increasing Carbon Chain?

Q 8.

1. How does Propyne react with following reagents?
   (i) AgNO₃ / NH₄OH
   (ii) Cu₂C ₂/NH_AOH
   (iii) H₂O/H₂SO₄ HgSO₄
   (iv) NaNH₂
   
2. What am Condensation Reactions? Explain Aldol condensation with three examples.

Q 9.

1. Discuss the stability of benzene in detail with reference to 1, 3, 5 cyclohexatripne.
2. What is Fermentation? How Ethyl Alcohol can be prepared by this method from Molasses?