Rawalpindi Board 2017
Chemistry Part-II
Group 1
NOTE: Write answers to the questions on the objective answers sheet provided. Four possible answers A, B, C or D to each question are given. Which answer to consider correct, fill the corresponding circle A, B, C or D given in front of each question with maker or pen ink on the answer sheet provided.

• Which of the following is a typical transition metal?

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

• In t-butyl alcohol, the tertiary carbon atom is bonded to:

1. Tow hydrogen atoms
2. Three hydrogen atoms
3. One hydrogen atoms
4. No hydrogen atoms

• The presence of double bond in a compound is sign of:

1. saturation
2. Unsubstitution
3. Substitution
4. Alkylation

• Which of the following acid can be used as a catalyst in friedal-craft reactions?

1. HNO₃
2. AlCl₃
3. BeCl₂
4. BCl+₃

• SN₂ reactions can be best carried out with:

1. Primary alkyl Halide
2. Secondary alkyl Halide
3. Tertiary alkyl Halide
4. Vicinal Dihalide

• Which compound shows maximum hydrogen bonding with water?

1. CH₃OH
2. C₂H­₅OH
3. CH₃ –O-CH₃
4. C₆H₅OH

• Ketones are prepared by oxidation of:

1. primary alcohol
2. secondary alcohol
3. tertiary alcohol
4. phenol

• Which acid is used in manufacture of synthetic fiber?

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

• Which is following is not a fatty acid?

1. Propanoic acid
2. Acetic acid
3. Phthalic acid
4. Butanoic acid

• A polymeric substance that is formed in the liquid state and then hardened to a rigid solid is called a:

1. fiber
2. varnish
3. plastic
4. polyamide resin

• Phosphorous helps the growth of:

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

• To avoid the formation of toxic compounds with chlorine which substance is used for disinfecting water:

1. KMnO₄
2. Chloramines
3. O₃
4. Alums

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

1. Mg > Sr
2. Ba > Mg
3. Lu > Ce
4. Cl > l

• Which ion will have maximum value of heat of hydrogen?

1. Na⁺¹
2. Cs⁺
3. Ba⁺²
4. Mg⁺²

• Which element among the following belongs to group IVA of periodic table?

1. Barium
2. Iodine
3. Tin
4. Oxygen

• The oxidation of NO in air Produses:

1. N₂ O
2. N₂O₃
3. N₂O₄
4. N₂O₅

• Which halogen will react spontaneously with Au(s) to produce Au³⁺?

1. Br₂
2. F₂
3. I₂
4. Cl₂

SUBJECTIVE PART
SECTION B

NOTE:-Write same question number and its part number on answer book, as given in the question paper.

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

1. What is Lanthanide contraction?
2. Why lime is added to an acidic soil?
3. Write the formulas of Phosphorite Chile Saltpeter.
4. How do the Leather Tanneries pollute water?
5. What is the action of an aqueous solution of on litmus?
6. How H₃BO₃ can be prepared from Borax?
7. P₂O₅ is a powerful dehydrating agent. Give two equations.
8. How aqua regia reacts with gold? Give equation.
9. What is smog? What conditions are required for its formation?
10. What is co-ordination sphere? Give an example.
11. Why the oxidation states vary in a period but remain almost constant in a group?
12. What is meant by typical and non-typical transition elements? Give one example in each

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

2. What is iodized salt? Write its use.
3. What are the conditions for cis and Trans isomerism?
4. Write two identification tests of akenes.
5. How are alkanes produced by Wurtz's synthesis?
6. What happens when hydrogen iodide is added to ethers?
7. What are the essential conditions for fermentation?
8. How do you justify that 150.5 KJ/mole is the resonance energy of benzene?
9. How is benzene converted into Toluene and nitrobenzene?
10. How does the bond energy of C-X bond affect the reactivity of alkyl halides?
11. Write the reaction of bleaching powder with ammonia and carbondioxide.
12. Write the structural formula of neopentane and 3-Ethylpentane.
13. What are carbocyclic compounds? Write one example.

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

1. Justify that aldehydes with no hydrogen give Cannizzaro reaction.
2. Write only names the factors which effect the activity of enzymes.
3. What is the different between essential and non-essential Amino acids?
4. What is Ninhydrin Test?
5. Why Tollen's test is called as Silver Mirror Test?
6. Write reaction involved in formation of Nylon6.6.
7. What do you mean by denaturation of protein?
8. Define clinker? How is it converted to cement?
9. What is the role of K(potassium) in growth of plant?

SECTION-C

Note: Attempt any THREE questions.

Q 5.

1. Define hydrides? Discuss ionic hydrides in detail.
2. Discuss the peculiar behaviour of Beryllium.

Q 6.

1. Describe the rules for naming coordination complexes?
2. Explain the process of incineration of industrial waste?

Q 7.

1. Discuss the four types of structural isomerism.
2. Write a detailed note on S. mechanism.

Q 8.

1. How will you convert ethyne to (0- Ethane (ii). Acetaldehyde (iii). Divinyl acetylene (iv). Glyoxalin
2. Explain the mechanism of Aldol condensation reaction in detail.

Q 9.

1. Describe the structure of Benzene on the basis of atomic orbital treatment.
2. How will you convert (i). Methanol into Ethanol (ii). Ethanol into Methanol.

Rawalpindi Board 2017
Chemistry Part-II
Group 2

NOTE: Write answers to the questions on the objective answers sheet provided. Four possible answers A, B, C or D to each question are given. Which answer to consider correct, fill the corresponding circle A, B, C or D given in front of each question with maker or pen ink on the answer sheet provided.

• Cannizzaro's reaction is not given by

1. Formaldehyde
   
2. Acetaldehyde
   
3. Benzaldehyde
   
4. Trimethylacetaldehyde

• Synthetic rubber is made by polymerization of

1. Chloroform
   
2. Chloroprene
   
3. Acetylene
   
4. Divinyl acetylene

• Tincal is a mineral of

1. Al
   
2. B
   
3. Si
   
4. C

• Which one of these polymers is an addition polymer?

1. Nylon-6,6
   
2. Polystyrene
   
3. Terylene
   
4. Epoxy resin

• Which one is a non-typical transition element?

1. Cr
   
2. Mn
   
3. Zn
   
4. Fe

• Methyl Alcohol is not used

1. As a solvent
   
2. As an antifreezing agent
   
3. As a substitute for petrol
   
4. For denaturing of ethyl alcohol

• How many zones through which charge passes in a rotary kiln?

1. 04
   
2. 03
   
3. 02
   
4. 05

• Which of the following is not a fatty acid?

1. Propanoic Acid
   
2. Acetic acid
   
3. Phthalic acid
   
4. Butanoic acid

• The correct statement is:

1. Na⁺ is smaller than Na atom
   
2. Na⁺ is larger than Na atom
   
3. CI^- is smaller than CI atom
   
4. Cl^- ion and CI atom are equal in size

• In the Down's Cell, CaCl₂ is added to NaCI to:

1. Increase the solubility
   
2. Increase the dissociation
   
3. Increase conductivity
   
4. lower its melting point

• The solution of the acid used for seasoning of food is:

1. Formic acid
   
2. Benzoic acid
   
3. Acetic acid
   
4. Butanoic acid

• The benzene molecule contains

1. Three double bonds
   
2. Two double bonds
   
3. One double bond
   
4. Delocalized electron charge

• For which mechanism, the first step involved is the same?

1. E₁ and E₂
   
2. E₂ and SN₂
   
3. SN₁ and E₂
   
4. E₁ and SN₁

• Hydrogen bond is the strongest between the molecules of

1. HF
   
2. HCI
   
3. HBr
   
4. HI

• A single chloride free radical can destroy how many ozone molecules?

1. 100
   
2. 100000
   
3. 10000
   
4. 10

• Laughing gas is chemically

1. NO
   
2. N₂O
   
3. NO₂
   
4. N₂O₄

• Linear shape is associated with which type of hybridization.

1. Sp
   
2. Sp²
   
3. Sp³
   
4. dsp²

SUBJECTIVE PART
SECTION B

NOTE:-Write same question number and its part number on answer book, as given in the question paper.

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

1. CO₂ is gas at room temperature but SiO₂ is solid. Give reason.
2. The oxidation states vary in a period but remain almost constant in a group. Why?
3. What is effect of heat on orthoboric acid? Write chemical equations.
4. How gypsom is converted into plaster of paris? Write chemical equation also.
5. Justify that ZnO is amphoteric in nature.
6. Alkali metals are strong reducing agents. Give reason
7. What is recycling of raw materials?
8. How does P₂O₃ react with water in cold and hot states?
9. What are transition metals? Why am they so called?
10. What is Biosphere
11. What is Chromyl chloride test? Write chemical equation also.
12. Show with two reactions that H₂SO₄ is strong dehydrating agent?

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

1. What is function of iodized salt?
2. How does ethyne react with ammonical silver nitrate?
3. Give any two uses of helium.
4. What is meant by heterocyclic compounds? Give two examples.
5. How vital force theory was rejected by Wohler?
6. Give the mechanism of bromination of ethyne.
7. What is meant by denaturing of Ethyl alcohol?
   
8. How is diethyl ether prepared by Williamson's synthesis?
9. How benzene can be prepared from sodium benzoate and phenol?
10. What are two main classes of polycyclic aromatic hydrocarbons? Give one example of each.
11. Give two chemical reactions to prepare ethyl chloride from ethyl alcohol.
12. Why does SN₂ mechanism give a product with inversion of configuration? Show with one reaction.

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

1. Give mechanism of addition of HCN to acetaldehyde.
2. Give two remarkable properties of enzymes.
   
3. How will you distinguish between acetaldehyde and Benzaldehyde?
4. In what way fats and oils are different?
5. What is vinegar? How is it prepared from ethanol?
6. What are fatty acids? Give one example.
   
7. Define cement. Give essential constituents of cement.
   
8. What are fertilizers? Why are they needed?
9. Define the given terms.
   (i) Acid number
   (ii) Iodine number

SECTION-C

Note: Attempt any THREE questions.

5. (a) What are periods? Discuss various periods of the Periodic Table.
   Describe with diagram the manufacture of sodium by Down's cell. Also write its electrode reactions.

6. (a) Describe with diagram the manufacture of steel by Bessemer's process.
   (b) How is water purified by
   (i) Aeration
   (ii) Coagulation

7. (a) Explain classification of organic compounds on the basis of carbon skeleton.
   (b) Explain SN₂ mechanism in detail.

8. (a) Make the following changes.
   (i) ethyne into chloroprene
   (ii) ethyne into Benzene
   (b) Describe laboratory method of preparation of formaldehyde with diagram.

9. (a) Describe the structure of Benzene on the basis of atomic orbital treatment.
   (b) Describe two methods for the preparation of ethyl alcohol on commercial scale.