Chemistry
(Objective)
(Inter-II)
Note:- You have four choices for each objective type question as A, B, C and a The choice which you think is correct; fill that circle in front of that question number. Use marker or pen to fill the circles. result in zero mark in that question. Attempt as many questions as given in objective type question paper and leave others blanks. Write the letter A, B, C or D in the column (write correct option) against each question.If there is a contradiction in the bubble and liana written answer, bubble option will be considered correct.

Question#1

• Polymeric halides arc formed by the elements
  
  (A) More electropositive
  (B) Less electropositive
  (C) More electronegative
  (D) Less electronegative
  
  
• LiNO₃ decompose to give products
  
  (A) Li₂O+NO₂+O₂
  (B) Li₂O+NO+O₂
  (C) Li₂O+NO
  (D) Li₂O₂+NO+0₂
  
  
• In Borax Bead Test, colour of Cupric borates are
  
  (A) Red
  (B) Blue
  (C) Green
  (D) Colourless
  
  
• Out 0f all the elements of group VI A, the highest melting and boiling points is shown by the element:
  
  (A) Te
  (B) Se
  (C) S
  (D) Pb
  
  
• Iodine penta oxide (I2O5) is used for the quantitative analyses of:
  
  (A) I₂
  (B) CO
  (C) CO₂
  (D) H₂S
  
  
• The Chemical formula of chromyl chloride is
  
  (A) CrOCI₂
  (B) CrO₂C1
  (C) CrO₂Cl₂
  (D) Cr₂O₃C1₂
  
  
• Dimethyl ether may show which type of isomerism
  
  (A) Tautomerism
  (B) Metamerism
  (C) Geometric
  (D) Functional group
  
  
• Vinyl acetylene combine with hydrochloric acid (HCI) to from
  
  (A) Polyacetylene
  (B) Benzene
  (C) Chloroprene
  (D) Divinyl acetylene
  
  
• Total number of π -electrons in benzene are:
  
  (A) 3
  (B) 6
  (C) 12
  (D) 18
  
  
• In SN₂ mechanism, the rate of bond formation is bond breakage.
  
  (A) Less than
  (B) Equal to
  (C) Grater than
  (D) Can not be predicted
  
  
• Phenol can be identified by the test
  
  (A) Bromine water
  (B) Chlorine water
  (C) Lucas test
  (D) Bayer's test
  
  
• Silver Mirror test is given by which one of the following carbonyl compounds
  
  (A) Crotonaldehyde
  (B) Pentanone.
  (C) Acetone
  (D) Aceto phenone
  
  
• The carbon atom of a Carbonyl pup is
  
  (A) SP- hybridized
  (B) Spy-hybridized
  (C) Sp34tybridized
  (D) Sp-Sp hybridized
  
  
• A cyclic dimmer of acetic acid is formed when it is added to Benzene. The number of Oxygen atoms in a dimmer ring is/are:
  
  (A) One
  (B) Two
  (C) Four
  (D) six
  
  
• The reaction between fat and Sodium hydroxide (NaOH) is called:
  
  (A) Esterification
  (B) Hydrogenolysis
  (C) Saponification
  (D) Fermentation
  
  
• The Percentage of lime (CaO) in Portland cement is
  
  (A) 1.0
  (B) 2.5
  (C) 62
  (D) 60
  
  
• In purification of potable water the coagulant used is
  
  (A) Nickel sulphate
  (B) Copper Sulphate
  (C) Barium sulphate
  (D) Any Alum

SUBJECTIVE TYPE

2. Answer briefly any EIGHT parts from the followings:-

• Why the ionization energies decreases down the groups.
• How does Hydrogen resemble with elements of group IV A. Write two similarities.
• Give reason that alkali metals are strong reducing agents.
• When Sodium reacts with water the hydrogen which cvolves catches fire, why?
• What are the advantages of Down's cell for the preparation of sodium on cornmercial scale?
• Write four uses of sodium silicates.
• What is asbestos? Give its two uses.
• What is the- effect of temperature on semiconductor.
• Give two important applications of helium .
• How the entrapped gases arc removed from the steel?
• Write name and structure of two aromatic heterocyclic compounds.
• I -Butene does not show geometrical isomerism, but 2-Butene does. Give reason.

3. Answer briefly any, EIGHT parts from the followings:-

• How do the members of group VI, A (except oxygen) show +4 and 6+ oxidation state.
• Phosphoric Acid is a weak tribasic acid. Give its three reactions of different salts formation by its reactions with (NaOH)?
• How can Ethyne be prepared commercially from Calcium Carbide.
• Convert I -Butene into 1-Butyne?
• Write the reaction when mixture of benzene vapors and Oxygen is passed over heated Vanadium pentioxide.
• Write names and draw structures of three possible isomers of Xylene?
• Prepare n-Butane by Wurtz’s Reaction?
• How is reduction of 1- chrolopropane done to prepare propane?
• Write the reaction of Iodoform formation by using acetone?
• Convert acetaldehyde into paraldehyde b a reaction which is done in presence &dilute H₂SO₄.
• How does Hydrolysis of triglyceride occur to prepare glycerol-i'
• What do you mean by saponification number?

4. Answer briefly any MX parts from the followings:-

• Writ down a chemical reaction to distinguish between methanol and ethanol.
• Write down reaction for the preparation of Bakellete.
• Write down two methods for the preparation of Phenol.
• What are the important uses of alcohols
• How hydrolysis of ester leads the formation or acetic acid.
• Discuss strecker synthesis roc the preparation of amino acids..
• What are the prospect of the cement industry in Pakistan_
• What Ore Fertilizers and why they, are required?
• Why is Ozone layer depleting?

SECTION -II

Note: Attempt any three questions
Question#5
(a) Explain periodic trend in the following Physical properties
(i) Ionization Energy
(ii) Oxidation State
(b) Compare the Chemical behavior of Lithium with magnesium

Question#6
(a) Discuss Geometric isomerism with at least two examples
(b) How will you prepare secondary and tertiary alcohol with the help of Grignard reagent?

Question#7
(a) How would you synthesize the following compounds stalling from ethyne
(i) Acetaldehyde
(ii) Ethane
(iii) Benzene
(iv) Methyl nitrile
(b) Give the reactions of Acetone and Acetaldehyde with
(i) Hydroxyl amine
(ii) Hydrazine

Question#8
(a) Write down mechanisms for
(i) Sulphonation
(ii) Nitration of Benzene 
(b) Write few- methods for the preparation of carboxylic acids.

Question#9
(a) Write down any four rules for naming complex compounds.
(b) Why is ozone layer depleting? W hat will happen when the conc of ozone will he decreased?