SAHIWAL BOARD 2017
PAPER CHEMISTRY
PART-2
Time: 20 MM.
(Objective Part)
Marks: 17
Note: You have four choice for each objective type question as A, B, C and D. The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. Cutting or filling two or more circles will result in zero mark in that question.

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

(A) Two hydrogen atoms
(B) Three hydrogen atoms
(C) One hydrogen atom
(D) No hydrogen atom

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

(A) Saturation
(B) Un-saturation
(C) Substitution
(D) none of these

• The electrophile in aromatic sulphonation is

(A) H₂SO₄
(B) HSO₄
(C) SO₃
(D) SO₄

• Which one of the following is not a nucleophile?

(A) H₂O
(B) H₂S
(C) BF₃
(D) NH₃

• According to Lewis concept Ethers behave as

(A) Acid
(B) Base
(C)Acid as well as base
(D) none of these

• Cannizzaro's reaction is not given by

(A) Formaldehyde
(B) Acetaldehyde
(C) Benzaldehyde
(D) Trimethylacetaldehyde

• Which of the following is not a fatty acid?

(A) Propanoic acid
(B) Acetic acid
(C) Phthalicacid
(D) Butanoic acid

• Which of these polymers is an addition Polymer?

(A) Nylon- 6,6
(B) polystyrene
(C) Terylene
(D) Epoxy resin

• Ecosystem is a smaller unit of

(A) Lithosphere
(B) Hydrosphere
(C) Atmosphere
(D) Biosphere

• Which is note calcareous material?

(A) Lime
(B) Clay
(C) Marble
(D) Marine shell

• Acetamide is prepared by

(A) Heating ammonium acetate
(B) Heating methyl cyanide
(C) Heating ethyl acetate
(D) The hydrolysis of methyl cyanide

• Mark the correct statement

(A) Na⁺ is smaller than Na atom
(B) Na⁺ is larger than Na atom
(C) Cl^-1 is smaller than CI atom
(D) Cl^-1 (ion) and Cl (atom) are equal in size.

• Which one of the following is not an alkali metal?

(A) Francium
(B) Cesium
(C) Rubidium
(D) Radium

• The brown gas formed, when metal reduces HNO₃ to

(A) N₂O₅
(B) N₂O₃
(C) NO₂
(D) NO

• Which metal is used in thermite process because of its activity?

(A) Iron
(B) Copper
(C) Aluminum
(D) Zinc

• Which is the strongest acid?

(A) HC1O
(B) HClO₂
(C) HC1O₃
(D) HCIO₄

• The strength of binding energy of transition elements depends upon

(A) No. of electron pairs
(B) No. of unpaired electrons
(C) No. of neutrons
(D) No. of protons

SAHIWAL BOARD 2017
PAPER CHEMISTRY
PART-2
Time: 3:10 Hours
(Subjective Part)
Marks: 83
Section-I

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

1. What is Dobereiner's Law of triads?
2. Why diamond is a non-conductor and graphite is fairly a good conductor?
3. Why lime Water turns milky with CO₂ but becomes clear with excess of CO₂?
4. Write two (02) points to show peculiar behavior of Beryllium.
5. Write two uses of silicones.
6. Write down two (02) uses of boric acid.
7. How does nitrogen differ from other elements of its group?
8. Write 'Ring test' for the confirmation of nitrates.
9. How chromate ions are converted into dichromate ions?
10. What do you mean by co-ordination number?
11. What does coagulation mean?
12. How detergents are threat to aquatic animal life'?

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

1. Reaction of chlorine with aqueous solution of NaOH at I5°C is a disproponionation. Justify?
2. Give two applications or Radon gas.
3. What is catalytic cracking?
4. Define alicyclic compounds. Give two examples.
5. How alkanes are prepared from aldehydes and ketones?
6. Give a chemical test which shows that ethane has a double bond.
7. Give two reactions which confirm presence of three double bonds in benzene ring.
8. What happens when a mixture of benzene and air is passed over heated V₂O₅?
9. What are elimination reactions? Give an example.
10. Prepare 1-butanol starting from ethyl magnesium bromide.
11. Give structural formula of 1,2-ethanediol and tartaric acid.
12. Give a chemical test to distinguish between 1-propanol and 2-propanol.

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

1. Prepare the following compounds from acetaldehyde.
   (a) Lactic acid
   (b) Acetic acid
2. What is Fehling solution test?
3. How will you prepare from acetic acid?
   (a) Acetic anhydride
   (b) Ethyl alcohol
4. How will you prepare Acetamide from acetic acid?
5. What are the following?
   (a) Isoenzyme
   (b) Nucleotide
6. What is the chemical nature of enzyme?
7. What is meant by rancidity of fats and oils?
8. What are the following?
   (a) Lignin
   (b) Clinker
9. Why neutral sulphite semi-chemical process is mostly used in paper industry?
   (b) Write down four important characters of catalysts.