BISE Multan · Class 12 · Chemistry

BISE Multan · Class 12 · Chemistry · 2025 · Second Annual · Code 4481

2025 · Second Annual

Transcribed from the identified examination paper. Check the board, session and course before use. SchoolOrbit is not affiliated with the issuing board.

Objective

Source code: 4481 · Printed marks: 17 · Time: 20 Minutes

OBJECTIVE

Q1(1)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which statement is incorrect?
- (A)
  All the metals are good conductor of electricity
- (B)
  All the metals are good conductor of heat
- (C)
  All the metals form positive ions
- (D)
  All the metals form acidic oxides
Q1(2)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
The Element which is deposited at cathode during the electrolysis of brine in diaphragm cell?
- (A)
  $H_{2}$
- (B)
  $N a$
- (C)
  $C l_{2}$
- (D)
  $O_{2}$
Q1(3)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Chemical composition of colemanite is:
- (A)
  $C a B_{4} O_{7} .4 H_{2} O$
- (B)
  $C a_{2} B_{6} O_{11} .5 H_{2} O$
- (C)
  $N a_{2} B_{4} O_{7} .4 H_{2} O$
- (D)
  $C a N a B_{5} O_{9} .8 H_{2} O$
Q1(4)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which catalyst is used in contact process?
- (A)
  $S O_{3}$
- (B)
  $F e_{2} O_{3}$
- (C)
  $V_{2} O_{5}$
- (D)
  $A g_{2} O$
Q1(5)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which is the strongest acid?
- (A)
  $H C l O_{3}$
- (B)
  $H C l O_{4}$
- (C)
  $H C l O$
- (D)
  $H C l O_{2}$
Q1(6)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which is a non-typical transition element?
- (A)
  Cr
- (B)
  Mn
- (C)
  Fe
- (D)
  Zn
Q1(7)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
In t-butyl alcohol, the tertiary carbon is bonded to:
- (A)
  No hydrogen atom
- (B)
  Three hydrogen atoms
- (C)
  One hydrogen atom
- (D)
  Two hydrogen atoms
Q1(8)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Synthetic rubber is made by polymerization of:
- (A)
  Chloroform
- (B)
  Acetylene
- (C)
  Chloroprene
- (D)
  Divinyl acetylene
Q1(9)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
During nitration of benzene, the active nitrating agent is:
- (A)
  $N O_{3}$
- (B)
  $N O_{2}^{+}$
- (C)
  $N O_{2}$
- (D)
  $H N O_{3}$
Q1(10)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
When $C O_{2}$ is made to react with ethyl magnesium iodide, followed by acid hydrolysis, the product formed is:
- (A)
  Propanoic acid
- (B)
  Propane
- (C)
  Propanal
- (D)
  Propanol
Q1(11)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which enzyme is not involved in fermentation of starch?
- (A)
  Diastase
- (B)
  Zymase
- (C)
  Urease
- (D)
  Invertase
Q1(12)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Ketones are prepared by oxidation of:
- (A)
  Primary alcohol
- (B)
  Secondary alcohol
- (C)
  Tertiary alcohol
- (D)
  all of these
Q1(13)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which is not a fatty acid?
- (A)
  Propanoic acid
- (B)
  Acetic acid
- (C)
  Phthalic acid
- (D)
  Butanoic acid
Q1(14)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which of these polymers is an addition polymers?
- (A)
  Nylon-6,6
- (B)
  Epoxy resin
- (C)
  Terylene
- (D)
  Polystyrene
Q1(15)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
Which woody raw material is used for the manufacture of paper pulp?
- (A)
  Poplar
- (B)
  Bagasse
- (C)
  Cotton
- (D)
  Rice straw
Q1(16)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
The $p H$ range of the acid rain is:
- (A)
  7-6.5
- (B)
  6.5-6
- (C)
  6-5.6
- (D)
  Less than 5
Q1(17)
You have four choices for each objective type question as A, B, C and D. The choice which you think is correct, fill that bubble in front of that question number, on bubble sheet. Use marker or pen to fill the bubbles. Cutting or filling two or more bubbles will result in zero mark in that question.
A single chloride free radical can destroy how many ozone molecules?
- (A)
  100
- (B)
  100,000
- (C)
  10,000
- (D)
  10

Subjective

Printed marks: 68 · Time: 2.40 Hours

NOTE: Write same question number and its parts number on answer book, as given in the question paper.
NOTE: Attempt any three questions.

SECTION-I

2
Attempt any eight parts.
Q2(i)
Non metallic character decreases from top to bottom in a group, give reason.
(2 marks)
Q2(ii)
Define hydration energy, which factors affect it?
(2 marks)
Q2(iii)
Write the formula of Epsom salt and Soap stone.
(2 marks)
Q2(iv)
Complete the equation. $2 N a + C_{2} H_{2} ⟶$
(2 marks)
Q2(v)
Define functional group and write their importance.
(2 marks)
Q2(vi)
How crude oil was formed in nature?
(2 marks)
Q2(vii)
Alkynes are less reactive than alkenes and more reactive than alkanes, give reason.
(2 marks)
Q2(viii)
What is the importance of IUPAC Nomenclature?
(2 marks)
Q2(ix)
Define monocyclic aromatic hydrocarbons and give one example.
(2 marks)
Q2(x)
Draw structure of hydroxy benzoic acid and o-xylene.
(2 marks)
Q2(xi)
Prepare 1-Propanol using grignard reagent.
(2 marks)
Q2(xii)
Define $β$ -Elimination reactions with one example.
(2 marks)
3
Attempt any eight parts.
Q3(i)
Write down any two uses of Lead compounds in paints.
(2 marks)
Q3(ii)
Why are liquid silicones preferred over ordinary organic lubricants?
(2 marks)
Q3(iii)
Give any two reactions of $H_{2} S O_{4}$ which show it to be a dehydrating agent.
(2 marks)
Q3(iv)
What is the principle of contact process for the manufacture of sulphuric acid?
(2 marks)
Q3(v)
How ethers are prepared by Williamson’s synthesis?
(2 marks)
Q3(vi)
Convert phenol into phenyl acetate.
(2 marks)
Q3(vii)
Give the mechanism of addition of HCN to acetone.
(2 marks)
Q3(viii)
Which reaction is used for the separation and purification of carbonyl compounds from alcohols? Give its mechanism.
(2 marks)
Q3(ix)
What is glacial acetic acid?
(2 marks)
Q3(x)
Draw a dimer of a carboxylic acid formed in non-polar solvents.
(2 marks)
Q3(xi)
Mention any four points of importance of enzymes.
(2 marks)
Q3(xii)
How polystyrene is obtained by the polymerization of styrene? Give its uses.
(2 marks)
4
Attempt any six parts.
Q4(i)
Why HF is weaker acid than HCl?
(2 marks)
Q4(ii)
What is disproportionation reaction? Give an example
(2 marks)
Q4(iii)
What are Ligands? Give types of Ligands.
(2 marks)
Q4(iv)
What are Chelates? Give an example.
(2 marks)
Q4(v)
Write down four essential qualities of good fertilizer.
(2 marks)
Q4(vi)
What is the role of Nitrogen in plant growth?
(2 marks)
Q4(vii)
How detergents are threat to aquatic life?
(2 marks)
Q4(viii)
What are the harmful effects of chlorinated water?
(2 marks)
Q4(ix)
How Leather tanneries pollute the water?
(2 marks)

SECTION-II

NOTE: Attempt any three questions.

Q5
(8 marks)
1. (a)
  Define Hydrides. Give their classification and properties.
  (1+1+2=4)
2. (b)
  Describe the commercial preparation of Sodium by Down’s cell with diagram.
  (3+1=4)
Q6
(8 marks)
1. (a)
  What is orbital hybridization? Explain $s p^{3}$ -hybridization with reference to Methane.
  (1+3=4)
2. (b)
  How benzene reacts with (i) $O_{2}$ in the presence of $V_{2} O_{5}$ (ii) $B r_{2}$ (iii) $H_{2}$
  (2+1+1=4)
Q7
(8 marks)
1. (a)
  Describe the oxidation reactions of alkene in detail.
  (4 marks)
2. (b)
  Explain Aldol condensation reaction in detail with example.
  (4 marks)
Q8
(8 marks)
1. (a)
  How Ethanol is prepared from molasses and starch?
  (2+2=4)
2. (b)
  Write down the reaction of Acetic acid with $S O C l_{2}$ . Also write mechanism for this reaction.
  (1+3=4)
Q9
(8 marks)
1. (a)
  Give commercial uses of Fluorine, Chlorine and their compounds. (any four)
  (4 marks)
2. (b)
  Give composition of wrought iron. How is wrought iron manufactured from cast iron?
  (4 marks)

Original source references (5)

The original files and numbering are retained. Equivalent files do not repeat the questions above.

Objective · 4481 · Printed marks: 17 · Time: 20 Minutes
Objective · 4483 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4485 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Objective · 4487 · Printed marks: 17 · Time: 20 Minutes : same questions, source numbering preserved separately
Subjective · psp_3658cfd6f8ba10a4e921725798560433 · Printed marks: 68 · Time: 2.40 Hours